Clinical Focus

  • Gastroenterology
  • Hepatology (Liver)
  • Liver Transplantation

Academic Appointments

Professional Education

  • Internship:Dow Medical College (1991) Pakistan
  • Fellowship:Stanford University School of Medicine (1999) CA
  • Board Certification: Transplant Hepatology, American Board of Internal Medicine (2010)
  • Board Certification: Gastroenterology, American Board of Internal Medicine (2000)
  • Residency:Brown University Program (1996) RI
  • Internship:University of Minnesota School of Medicine (1993) MN
  • Internship:New York Medical College (1992) NY
  • Medical Education:Dow Medical College (1990) Pakistan

Research & Scholarship

Clinical Trials

  • Once-Daily Oral E5501 Tablets Used in Subjects With Chronic Liver Diseases and Thrombocytopenia Prior to Elective Surgical or Diagnostic Procedures Recruiting

    The purpose of this study is to evaluate the efficacy of once-daily Oral E5501 in subjects with chronic liver diseases and thrombocytopenia prior to elective surgical or diagnostic procedures, to evaluate the safety of short-term administration of E5501 and to evaluate the pharmacokinetics (PK) of E5501.

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  • Study of Nitazoxanide, Peginterferon Alfa-2a and Ribavirin in Treatment-Naive Hepatitis C Patients Not Recruiting

    The purpose of this study is to determine if nitazoxanide in combination with peginterferon alfa-2a and ribavirin is safe and effective in treating chronic hepatitis C in treatment-naive patients.

    Stanford is currently not accepting patients for this trial. For more information, please contact Shawna Thunen, (650) 723 - 5512.

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  • Risk Factors and Molecular Genomics of U.S. Patients With Chronic Liver Disease &Hepatocellular CA Not Recruiting

    To identify risk factors for the development and diagnosis of hepatocellular CA in patients with chronic hepatitis C and to use the data to ultimately develop an effective screening program.

    Stanford is currently not accepting patients for this trial. For more information, please contact Andrea Linder, (650) 725 - 4047.

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  • Study of Nitazoxanide, Peginterferon Alfa-2a and Ribavirin for the Treatment of Hepatitis C Not Recruiting

    The purpose of this study is to determine if nitazoxanide in combination with peginterferon alfa-2a and ribavirin is safe and effective in treating chronic hepatitis C in patients that have previously failed to respond to treatment with peginterferon and ribavirin.

    Stanford is currently not accepting patients for this trial. For more information, please contact Shawna Thunen, (650) 723 - 5512.

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  • PII of SBRT & Chemo for Unresectable Cholangiocarcinoma Followed by Liver Transplantation Not Recruiting

    The purpose of this study is to determine progression-free survival at 12 months for stereotactic body radiotherapy (SBRT) and chemotherapy for unresectable hilar cholangiocarcinoma (CCA). Investigators hope to learn more about neoadjuvant SBRT and chemotherapy for unresectable CCA, and if SBRT followed by chemotherapy can lead to successful liver transplantation. This knowledge is important for this patient group as this disease is a highly lethal malignancy that often presents as unresectable, however surgery or transplantation are the only curative options.

    Stanford is currently not accepting patients for this trial. For more information, please contact Laurie Ann Columbo, (650) 736 - 0792.

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2014-15 Courses


Journal Articles

  • Acute Liver Failure: A Potential Complication of Antithyroid Medication Use. Digestive diseases and sciences Chou, C., Wong, R. J., Higgins, J. P., Perumpail, R. B., Ahmed, A. 2015; 60 (7): 1924-1927

    View details for DOI 10.1007/s10620-014-3389-7

    View details for PubMedID 25366145

  • Sofosbuvir and simeprevir combination therapy in the setting of liver transplantation and hemodialysis TRANSPLANT INFECTIOUS DISEASE Perumpail, R. B., Wong, R. J., Ha, L. D., Pham, E. A., Wang, U., Luong, H., Kumari, R., Daugherty, T. J., Higgins, J. P., Younossi, Z. M., Kim, W. R., Glenn, J. S., Ahmed, A. 2015; 17 (2): 275-278


    We report safety, tolerability, and 12-week sustained virologic response with half-standard dose sofosbuvir and standard-dose simeprevir combination therapy in a hepatitis C virus genotype 1a-infected liver transplant recipient on hemodialysis - uncharted territory for sofosbuvir-based therapy. The patient was a non-responder to prior treatment with pegylated interferon plus ribavirin. Sofosbuvir efficacy was maintained despite pill-splitting and administration of half-standard dose, 200 mg per day. No drug-drug interactions were noted with tacrolimus-based immunosuppression. Laboratory tests remained stable or improved during therapy. Our observation, if reproduced in a larger study, may lead to significant improvement in clinical outcomes and cost savings in this patient population.

    View details for DOI 10.1111/tid.12348

    View details for Web of Science ID 000352219400013

    View details for PubMedID 25641426

  • Diabetes Mellitus, and Not Obesity, Is Associated with Lower Survival Following Liver Transplantation DIGESTIVE DISEASES AND SCIENCES Wong, R. J., Cheung, R., Perumpail, R. B., Holt, E. W., Ahmed, A. 2015; 60 (4): 1036-1044


    The impact of obesity on survival following liver transplantation is unclear, and existing studies report conflicting results. Our current study aims to further delineate the impact of obesity using population-based registry data from the USA.All US adult liver transplant recipients from 2003 to 2012 were evaluated using the United Network for Organ Sharing registry. The impact of obesity on survival following liver transplantation was further stratified into class I obesity [body mass index (BMI) 30.0-34.9 kg/m(2)], class II obesity (BMI 35.0-39.9 kg/m(2)), and class III obesity (BMI ≥ 40 kg/m(2)) and evaluated using Kaplan-Meier methods and multivariate Cox proportional hazards models.Overall, 57,255 patients with chronic liver disease underwent liver transplantation, among which 32.9 % had BMI ≥ 30 kg/m(2). While patients in all obesity classes had similar survival to patients with BMI 18.0-24.9 kg/m(2), the presence of concurrent diabetes mellitus resulted in significantly lower post-transplant survival. After multivariate regression, post-transplant survival in patients with class II obesity (HR 0.97; 95 % CI 0.89-1.05) or class III obesity (HR 0.99; 95 % CI 0.90-1.09) was not significantly lower than patients with BMI 18.0-24.9 kg/m(2), but diabetes mellitus was independently associated with lower post-transplant survival (HR 1.29; 95 % CI 1.21-1.36).In conclusion, obesity alone was not associated with lower post-transplant survival. However, DM, either alone or comorbid with obesity, is associated with significantly greater post-transplant mortality.

    View details for DOI 10.1007/s10620-014-3469-8

    View details for Web of Science ID 000354464900037

    View details for PubMedID 25596720

  • Nonalcoholic steatohepatitis is the second leading etiology of liver disease among adults awaiting liver transplantation in the United States. Gastroenterology Wong, R. J., Aguilar, M., Cheung, R., Perumpail, R. B., Harrison, S. A., Younossi, Z. M., Ahmed, A. 2015; 148 (3): 547-555


    Nonalcoholic steatohepatitis (NASH) has been predicted to become the leading indication for liver transplantation (LT) in the United States. However, few studies have evaluated changes in the etiology of liver diseases among patients awaiting LT, and none have focused on the effects of NASH on liver transplant waitlists in the United States.We collected data from the United Network for Organ Sharing and Organ Procurement and Transplantation Network registry from 2004 through 2013, on liver transplant waitlist registrants with hepatitis C virus (HCV) infection, NASH, alcoholic liver disease (ALD), or a combination of HCV infection and ALD. We compared differences in survival within 90 days of registration (90-day survival) and probability of LT among patients with different diseases using Kaplan-Meier and multivariate logistic regression models.Between 2004 and 2013, new waitlist registrants with NASH increased by 170% (from 804 to 2174), with ALD increased by 45% (from 1400 to 2024), and with HCV increased by 14% (from 2887 to 3291); registrants with HCV and ALD decreased by 9% (from 880 to 803). In 2013, NASH became the second-leading disease among liver transplant waitlist registrants, after HCV. Patients with ALD had a significantly higher mean Model for End-Stage Liver Disease score at time of waitlist registration than other registrants. However, after multivariate adjustment, patients with ALD were less likely to die within 90 days when compared with patients with NASH (odds ratio [OR] = 0.77; 95% confidence interval [CI]: 0.67-0.89; P < .001); patients with HCV infection or HCV and ALD had similar odds for 90-day survival compared with NASH patients. Compared with patients with NASH, patients with HCV (OR = 1.45; 95% CI: 1.35-1.55; P < .001), ALD (OR = 1.15; 95% CI: 1.06-1.24; P < .001), or HCV and ALD (OR = 1.29; 95% CI: 1.18-1.42; P < .001) had higher odds for 90-day survival.Based on data from US adult LT databases, since 2004 the number of adults with NASH awaiting LTs has almost tripled. However, patients with NASH are less likely to undergo LT and less likely to survive for 90 days on the waitlist than patients with HCV, ALD, or HCV and ALD.

    View details for DOI 10.1053/j.gastro.2014.11.039

    View details for PubMedID 25461851

  • Cost-effectiveness of all-oral ledipasvir/sofosbuvir regimens in patients with chronic hepatitis C virus genotype 1 infection. Alimentary pharmacology & therapeutics Younossi, Z. M., Park, H., Saab, S., Ahmed, A., Dieterich, D., Gordon, S. C. 2015; 41 (6): 544-563


    An all-oral, pegylated interferon (pegIFN)-free and ribavirin (RBV)-free single-tablet of ledipasvir (LDV) and sofosbuvir (SOF) is now approved for the treatment of patients infected with hepatitis C virus (HCV) genotype 1.To estimate the health economic outcomes for LDV/SOF compared with current treatments in US patients infected with HCV genotype 1.A hybrid decision-tree and Markov state-transition model was developed. For a cohort of 10 000 patients, the model captured outcomes for several pairings of LDV/SOF with comparators, including long-term health outcomes, number need to treat, life-years gained, quality-adjusted life-years (QALYS) gained, incremental cost-effectiveness ratios and costs per sustained virologic response (SVR). Patients with different levels of treatment experience and different cirrhosis stages were included.LDV/SOF decreased the number of advanced liver disease cases by 0-93% compared with current regimens or no treatment in treatment-naïve patients. In treatment-experienced [pegIFN plus ribavirin (PR) or protease inhibitor (PI) + PR] patients, treatment with LDV/SOF decreased the incidence of advanced liver disease complications in most of the cases analysed, except SOF + SMV. For all patient sub-cohorts, LDV/SOF was associated with the lowest 1-year costs per SVR and, with regard to lifetime incremental costs per QALY gained, was either dominant or the most cost-effective treatment. Overall, treatment initiation at earlier stages of liver fibrosis resulted in improved health economic outcomes.LDV/SOF is associated with more favourable short- and long-term health economic outcomes compared with current therapies for patients across all levels of treatment experience and cirrhosis stages.

    View details for DOI 10.1111/apt.13081

    View details for PubMedID 25619871

  • Recurrent Hepatocellular Carcinoma and Poorer Overall Survival in Patients Undergoing Left-sided Compared With Right-sided Partial Hepatectomy. Journal of clinical gastroenterology Valenzuela, A., Ha, N. B., Gallo, A., Bonham, C., Ahmed, A., Melcher, M., Kim, L. H., Esquivel, C., Concepcion, W., Ayoub, W. S., Lutchman, G. A., Daugherty, T., Nguyen, M. H. 2015; 49 (2): 158-164


    We aimed to determine the incidence and predictors of recurrent hepatocellular carcinoma (HCC) after partial hepatectomy.Liver transplantation is the preferred treatment for selected patients with HCC, but access to donor organs is limited. Partial hepatectomy is another accepted treatment option; however, postoperative recurrence is frequently observed.This is a retrospective cohort study of 107 consecutive patients who underwent partial hepatectomy for HCC between January 1993 and February 2011 at a US University Medical Center. Study endpoints were recurrent HCC, death, loss to follow-up, or last visit without HCC.The study cohort was 78% male with a median age of 61 years and 59% Asians. A total of 50 patients developed recurrent HCC (46.7%) after a median follow-up of 12 (1 to 69) months postresection. Recurrent HCC was significantly higher in patients with left-sided resection (41% at year 1, 54% at year 2, 62% at year 3, 81% at year 4, and 90% at year 5) compared with right-sided resection (18% at year 1, 34% at year 2, 36% at year 3, 44% at year 4, and 72% at year 5). In multivariate Cox proportional hazards model also inclusive of anatomic resection and TNM stage 3/4, left-sided resection was significantly associated with increased HCC recurrence (hazard ratio, 2.13; P=0.02; 95% confidence interval, 1.08-4.2) compared with right-sided resection.HCC recurrence rate is higher among those undergoing left-sided resection: 54% at year 2 and 81% at year 4. Liver transplantation should be considered in patients who are at high risk for recurrence.

    View details for DOI 10.1097/MCG.0000000000000144

    View details for PubMedID 24804988

  • Hepatic Encephalopathy Is Associated With Significantly Increased Mortality Among Patients Awaiting Liver Transplantation LIVER TRANSPLANTATION Wong, R. J., Gish, R. G., Ahmed, A. 2014; 20 (12): 1454-1461

    View details for DOI 10.1002/lt.23981

    View details for Web of Science ID 000345619600004

  • Long Term Trends and Racial/Ethnic Disparities in the Prevalence of Obesity JOURNAL OF COMMUNITY HEALTH Wong, R. J., Chou, C., Ahmed, A. 2014; 39 (6): 1150-1160


    Obesity is an epidemic associated with higher rates of hypertension, diabetes, and cardiovascular diseases. However, significant racial disparities in the prevalence of obesity have been reported. To evaluate racial disparities and trends in the prevalence of obesity and obesity-related diseases. A population-based retrospective cohort study utilized data from the 1985 to 2011 California Behavioral Risk Factor Survey. Trends in obesity prevalence were stratified by age, sex, race/ethnicity, and socioeconomic factors. Multivariate logistic regression models evaluated independent predictors of obesity. The prevalence of obesity in significantly increased from 1985 to 2011 (8.6 vs. 22.8%, p < 0.001). This increase was seen among men and women, and among all race/ethnic, age, and socioeconomic groups. Hypertension and diabetes also increased during this time period (hypertension 20.7-35.9%; diabetes 4.2-11.2%). Obesity prevalence was highest in blacks and Hispanics, and lowest in Asians (blacks 33.3%; Hispanics 28.8%; Asians 9.0%; p < 0.001). Obesity prevalence was associated with lower education level, lower income, and unemployment status. After adjustments for age, sex, co morbidities, and surrogates of socioeconomic status, the increased risk of obesity in blacks and Hispanics persisted (blacks OR 1.51; Hispanics OR 1.18), whereas Asians were less likely to be obese (OR 0.37). While the overall prevalence of obesity increased from 1985 to 2011, significant racial/ethnic disparities in obesity have developed, with the highest prevalence seen in blacks and Hispanics, and the lowest seen in Asians.

    View details for DOI 10.1007/s10900-014-9870-6

    View details for Web of Science ID 000344606900018

    View details for PubMedID 24715435

  • Cost-effectiveness analysis of sofosbuvir plus peginterferon/ribavirin in the treatment of chronic hepatitis C virus genotype 1 infection ALIMENTARY PHARMACOLOGY & THERAPEUTICS Saab, S., Gordon, S. C., Park, H., Sulkowski, M., Ahmed, A., Younossi, Z. 2014; 40 (6): 657-675


    Sofosbuvir, an oral NS5B nucleotide polymerase inhibitor, is indicated for the treatment of patients infected with hepatitis C virus (HCV).To evaluate the long-term health economic outcomes of sofosbuvir + pegylated interferon alfa/ribavirin (pegIFN/RBV) compared with current treatments in patients infected with HCV genotype 1 in the US.A decision-analytic Markov model was developed to estimate health outcomes, number needed to treat and short-term and long-term economic outcomes, including incremental cost-effectiveness ratios and cost per sustained virological response (SVR), for several sofosbuvir-comparator regimen pairings for a cohort of 10 000 patients. It considered three patient cohorts: treatment-naïve, treatment-experienced and treatment-naïve human immunodeficiency virus (HIV) co-infected. Subgroup analyses were conducted for treatment-naïve patients with and without cirrhosis.Reductions in the incidence of new cases of liver-disease complications with sofosbuvir + pegIFN/RBV compared with pegIFN/RBV, boceprevir + pegIFN/RBV, telaprevir + pegIFN/RBV and simeprevir + pegIFN/RBV were 64-82%, 50-68%, 43-58% and 33-56%, respectively. Sofosbuvir + pegIFN/RBV was typically associated with the lowest 1-year cost per SVR. When considering the lifetime incremental cost per quality-adjusted life-year gained, sofosbuvir + pegIFN/RBV was the most cost-effective treatment option assessed. Sofosbuvir + pegIFN/RBV generally dominated (less costly and more effective than) boceprevir + pegIFN/RBV, telaprevir + pegIFN/RBV and simeprevir + pegIFN/RBV.Sofosbuvir + pegIFN/RBV yields more favourable future health and economic outcomes than current treatment regimens for patients across all levels of treatment experience and cirrhosis stage, as well as for individuals with or without HIV co-infection.

    View details for DOI 10.1111/apt.12871

    View details for Web of Science ID 000340559900008

    View details for PubMedID 25065960

  • Mutations in HBV DNA polymerase associated with nucleos(t)ide resistance are rare in treatment-naive patients. Clinical gastroenterology and hepatology Vutien, P., Trinh, H. N., Garcia, R. T., Nguyen, H. A., Levitt, B. S., Nguyen, K., da Silveira, E., Daugherty, T., Ahmed, A., Garcia, G., Lutchman, G. A., Nguyen, M. H. 2014; 12 (8): 1363-1370


    Prior studies have detected hepatitis B virus (HBV) DNA polymerase mutations in treatment naïve patients. However, most of these studies used either direct PCR sequencing, which detects these mutations with low levels of sensitivity, or patient cohorts that were not well characterized. We investigated the prevalence of HBV mutations in DNA polymerase using a line probe assay.In a prospective, cross-sectional study, we enrolled 198 treatment-naïve patients with chronic hepatitis B (52.5% male, mean age 41 y), from February 2009 through May 2011, from 3 gastroenterology and liver clinics in Northern California. Exclusion criteria included infection with hepatitis C or D viruses or HIV. All patients completed a questionnaire (to determine demographics, history of liver disease, prior treatments, family medical history, drug and alcohol use, and environmental risk factors for hepatitis) that was administered by a research coordinator; mutations in HBV DNA polymerase were detected using the INNO-LiPA HBV DR v.3 assay.Most patients were Vietnamese (48.5%) or Chinese (36.4%), and were infected with HBV genotypes B (67.5%) or C (24.2%). Mutations in HBV DNA polymerase were found in 2 patients (1%): rtI233V (n = 1) and rtM250M/L (n = 1).In a multicenter prospective study of treatment-naïve patients with chronic hepatitis B, we detected mutations in HBV DNA polymerase in only 1%. Given the low prevalence of these mutations and the uncertain clinical significance of such quasi-species, routine HBV DNA polymerase mutation analysis cannot be recommended before initiation of antiviral therapy for treatment-naïve patients with chronic hepatitis B. The analysis requires further molecular and clinical studies.

    View details for DOI 10.1016/j.cgh.2013.11.036

    View details for PubMedID 24342744

  • Hepatitis C Virus Infection and Coronary Artery Disease Risk: A Systematic Review of the Literature DIGESTIVE DISEASES AND SCIENCES Wong, R. J., Kanwal, F., Younossi, Z. M., Ahmed, A. 2014; 59 (7): 1586-1593


    While hepatitis C virus (HCV) infection has been implicated in increasing the risk of coronary artery disease (CAD), conflicting reports exist regarding this association. We performed a systematic review to further investigate this association.We conducted a PubMed search of original research articles from January 1, 1995 to June 30, 2013 to identify case-control and cohort studies evaluating the association between HCV and CAD using keyword terms ["hepatitis c" or "HCV"] and ["coronary artery disease" or "heart disease" or "atherosclerosis."] The primary CAD-related endpoints included myocardial infarction, congestive heart failure, need for coronary artery bypass grafting, or transluminal percutaneous coronary angioplasty. Binary outcomes are reported as odds ratios (OR) with 95 % confidence interval (CI).We identified five studies (four cohort studies and one case-control study) that met our inclusion criteria. A significant association between HCV and CAD was demonstrated in one cohort study (adjusted HR 1.27; 95 % CI 1.22-1.31). One cohort study demonstrated a decreased risk of CAD associated with HCV (adjusted OR 0.74; 95 % CI 0.71-0.76). The remaining studies did not find a significant association between HCV and risk of CAD.The current systematic review demonstrates that the association between HCV and CAD remains unclear. We need more large, long-term cohort studies with clear definitions of patient population and endpoints to better ascertain the association between HCV and CAD.

    View details for DOI 10.1007/s10620-014-3222-3

    View details for Web of Science ID 000338344500036

    View details for PubMedID 24894512

  • Combination of racial/ethnic and etiology/disease-specific factors is associated with lower survival following liver transplantation in African Americans: an analysis from UNOS/OPTN database CLINICAL TRANSPLANTATION Wong, R. J., Ahmed, A. 2014; 28 (7): 755-761


    Higher rates of hepatitis C virus (HCV) recurrence and lower response to HCV antiviral therapy contribute to the lower post-liver transplantation (LT) survival among African Americans with HCV. The current study aims to evaluate race/ethnicity-specific and etiology-specific factors contributing to lower post-LT survival among African Americans in the USA. The 2002-2012 United Network for Organ Sharing registry was utilized to evaluate race/ethnicity-specific post-LT survival among patients with HCV, hepatocellular carcinoma (HCC), alcoholic liver disease (ALD), non-alcoholic steatohepatitis, and cryptogenic cirrhosis. From 2002 to 2012, HCV was the leading indication for LT. While African Americans accounted for 9.5% of all LT during this period, they had the lowest overall and etiology-specific five-yr post-LT survival. On multivariate Cox proportional hazards modeling, African Americans had significantly lower post-LT survival compared with non-Hispanic whites among patients with HCV (HR, 1.30; 95% CI, 1.19-1.41), HCC (HR, 1.49; 95% CI, 1.25-1.79), and ALD (HR, 1.52; 95% CI, 1.19-1.94). In conclusion, African Americans had the lowest post-LT survival among patients with HCV, HCC, and ALD. Race/ethnicity and the etiology of chronic liver disease were observed to have a combined detrimental effect leading to lower survival following LT in African Americans.

    View details for DOI 10.1111/ctr.12374

    View details for Web of Science ID 000339100800001

    View details for PubMedID 24750171

  • Improved survival outcomes in patients with non-alcoholic steatohepatitis and alcoholic liver disease following liver transplantation: an analysis of 2002-2012 United Network for Organ Sharing data CLINICAL TRANSPLANTATION Wong, R. J., Chou, C., Bonham, C. A., Concepcion, W., Esquivel, C. O., Ahmed, A. 2014; 28 (6): 713-721


    There is an increasing trend of patients with hepatocellular carcinoma (HCC) and non-alcoholic fatty liver disease undergoing liver transplantation in the U.S. Our study utilized data from the 2002-2012 United Network for Organ Sharing registry to evaluate MELD era trends in U.S. liver transplantations focused on patients with non-alcoholic steatohepatitis (NASH), hepatitis C (HCV), alcoholic liver disease, and HCC. Survival outcomes were stratified by liver disease etiology and compared across time periods using Kaplan Meier and Cox proportional hazards models. Patients with NASH were more likely to be women, had higher body mass index, and higher prevalence of diabetes and cardiac disease. However, overall long term survival was significantly higher in NASH and alcoholic liver disease patients (p < 0.001). Compared to HCV, NASH patients had significantly higher post-transplantation survival (HR 0.69, 95% CI 0.63-0.77), and lower risk of graft failure (HR 0.76, 95% CI 0.69-0.83). Despite having higher body mass index and higher prevalence of diabetes and cardiac disease, NASH patients had better post-liver transplantation survival compared to patients with HCV or HCC. Patients with alcoholic liver disease also had superior survival outcomes. However, these survival differences were limited to patients without HCC that underwent liver transplantation. This article is protected by copyright. All rights reserved.

    View details for DOI 10.1111/ctr.12364

    View details for Web of Science ID 000337690200011

    View details for PubMedID 24654688

  • Nonalcoholic Steatohepatitis Is the Most Rapidly Growing Indication for Liver Transplantation in Patients With Hepatocellular Carcinoma in the U. S. HEPATOLOGY Wong, R. J., Cheung, R., Ahmed, A. 2014; 59 (6): 2188-2195


    Nonalcoholic steatohepatitis (NASH) is currently the third leading indication for liver transplantation (LT) in the U.S. and is predicted to become the leading indication for LT in the near future. The trends in NASH-related hepatocellular carcinoma (HCC) among LT recipients in the U.S. remain undefined. We performed a retrospective cohort study to evaluate trends in the etiology of HCC among adult LT recipients in the U.S. from 2002 to 2012, utilizing national data from the United Network for Organ Sharing registry. From 2002-2012, there were 61,868 adults who underwent LT in the U.S., including 10,061 patients HCC. The total number and proportion of HCC LT recipients demonstrated a significant increase following the implementation of the model for end stage liver disease (MELD) scoring system in 2002 (3.3%, n=143 in 2000 vs. 12.2%, n=714 in 2005 vs. 23.3%, n=1336 in 2012). The proportion of HCV-related HCC increased steadily from 2002 to 2012, and HCV remained the leading etiology of HCC throughout the MELD era (43.4% in 2002 vs. 46.3% in 2007 vs. 49.9% in 2012). NASH-related HCC also increased significantly, and NASH is the second leading etiology of HCC-related LT (8.3% in 2002 vs. 10.3% in 2007 vs. 13.5% in 2012). From 2002 to 2012, the number of patients undergoing LT for HCC secondary to NASH increased by nearly 4-fold, and the number of LT patients with HCC secondary to HCV increased by 2-fold. Conclusion: NASH is the second leading etiology of HCC leading to LT in the U.S. More importantly, NASH is currently the most rapidly growing indication for LT in patients with HCC in the U.S. (Hepatology 2013;).

    View details for DOI 10.1002/hep.26986

    View details for Web of Science ID 000337567100020

    View details for PubMedID 24375711

  • Ethnic Disparities in the Association of Body Mass Index with the Risk of Hypertension and Diabetes JOURNAL OF COMMUNITY HEALTH Wong, R. J., Chou, C., Sinha, S. R., Kamal, A., Ahmed, A. 2014; 39 (3): 437-445


    Despite having lower body mass index (BMI) compared to other ethnic groups, Asians continue to develop significant metabolic diseases such as hypertension and diabetes. To evaluate the disparate association of BMI and risk of hypertension and diabetes in Asians. We retrospectively studied 150,753 adults from the 1985-2011 California Behavioral Risk Factor Survey. Trends in prevalence of obesity, hypertension, and diabetes were stratified by ethnicity. Multivariate logistic regression models evaluated the incremental effect of one unit BMI increase on risk of hypertension and diabetes and the disparate risks of hypertension and diabetes at different BMI thresholds. Asians had the lowest BMI among all groups. However, the impact of increasing BMI on risk of hypertension and diabetes was significantly greater in Asians. For each one unit increase in BMI, Asians were significantly more likely to have hypertension (OR 1.15; 95 % CI 1.13-1.18) compared to non-Hispanic whites, blacks, and Hispanics. Similar trends were seen for diabetes (Asians: OR 1.15; 95 % CI 1.13-1.18). The risk of hypertension in Asians with BMI ≥ 22 was similar to non-Hispanic whites with BMI ≥ 27 and blacks with BMI ≥ 28. The risk of diabetes in Asians with BMI ≥ 28 was similar to non-Hispanic whites with BMI ≥ 30. Despite lower overall BMI compared to other groups, weight gain in Asians is associated with significantly higher risks of hypertension and diabetes. Compared to other ethnic groups, similar risks of hypertension and diabetes are seen in Asians at much lower BMI.

    View details for DOI 10.1007/s10900-013-9792-8

    View details for Web of Science ID 000335392600005

    View details for PubMedID 24276618

  • Obesity and non-alcoholic fatty liver disease: Disparate associations among Asian populations. World journal of hepatology Wong, R. J., Ahmed, A. 2014; 6 (5): 263-273


    Obesity is a global epidemic contributing to an increasing prevalence of obesity-related systemic disorders, including nonalcoholic fatty liver disease. The rising prevalence of nonalcoholic steatohepatitis (NASH) will in the near future lead to end-stage liver disease in a large cohort of patients with NASH-related cirrhosis and NASH is predicted to be a leading indication for liver transplantation in the coming decade. However, the prevalence of obesity and the progression of hepatic histological damage associated with NASH exhibit significant ethnic disparities. Despite a significantly lower body mass index and lower rates of obesity compared to other ethnic groups, Asians continue to demonstrate a significant prevalence of hypertension, diabetes, metabolic syndrome and NASH. Ethnic disparities in central adiposity and visceral fat distribution have been hypothesized to contribute to these ethnic disparities. The current review focuses on the epidemiology of obesity and NASH among Asian populations.

    View details for DOI 10.4254/wjh.v6.i5.263

    View details for PubMedID 24868320

  • The impact of hepatitis C burden: an evidence-based approach ALIMENTARY PHARMACOLOGY & THERAPEUTICS Younossi, Z. M., Kanwal, F., Saab, S., Brown, K. A., El-Serag, H. B., Kim, W. R., Ahmed, A., Kugelmas, M., Gordon, S. C. 2014; 39 (5): 518-531


    Infection with the hepatitis C virus (HCV) has been considered a major cause of mortality, morbidity and resource utilisation in the US. In addition, HCV is the main cause of hepatocellular cancer (HCC) in the US. Recent developments in the diagnosis and treatment of HCV, including new recommendations pertaining to screening for HCV by the Centers for Disease Control and Prevention and newer treatment regimens with high efficacy, short duration and the potential for interferon-free therapies, have energised the health care practitioners regarding HCV management.To assess the full impact of HCV burden on clinical, economic and patient-reported outcomes.An expert panel was convened to assess the full impact of HCV burden on a number of important outcomes using an evidence-based approach predicated on Grading of Recommendations Assessment, Development and Evaluation methodology. The literature was summarised, graded using an evidence-based approach and presented during the workshop. Workshop presentations were intended to review recent, relevant evidence-based literature and provide graded summary statements pertaining to HCV burden on topics including the relationships between HCV and the development of important outcomes.The associations of HCV with cirrhosis, HCC, liver-related mortality, type 2 diabetes mellitus, rheumatological diseases and quality of life impairments are supported by strong evidence. Also, there is strong evidence that sustained viral eradication of HCV can improve important outcomes such as mortality and quality of life.The current evidence suggests that HCV has been associated with tremendous clinical, economic and quality of life burden.

    View details for DOI 10.1111/apt.12625

    View details for Web of Science ID 000330564900007

    View details for PubMedID 24461160

  • Primary Surgical Resection Versus Liver Transplantation for Transplant-Eligible Hepatocellular Carcinoma Patients DIGESTIVE DISEASES AND SCIENCES Wong, R. J., Wantuck, J., Valenzuela, A., Ahmed, A., Bonham, C., Gallo, A., Melcher, M. L., Lutchman, G., Concepcion, W., Esquivel, C., Garcia, G., Daugherty, T., Nguyen, M. H. 2014; 59 (1): 183-191


    Hepatocellular carcinoma (HCC) is a leading cause of mortality worldwide. Existing studies comparing outcomes after liver transplantation (LT) versus surgical resection among transplant-eligible patients are conflicting.The purpose of this study was to compare long-term survival between consecutive transplant-eligible HCC patients treated with resection versus LT.The present retrospective matched case cohort study compares long-term survival outcomes between consecutive transplant-eligible HCC patients treated with resection versus LT using intention-to-treat (ITT) and as-treated models. Resection patients were matched to LT patients by age, sex, and etiology of HCC in a 1:2 ratio.The study included 171 patients (57 resection and 114 LT). Resection patients had greater post-treatment tumor recurrence (43.9 vs. 12.9 %, p < 0.001) compared to LT patients. In the as-treated model of the pre-model for end stage liver disease (MELD) era, LT patients had significantly better 5-year survival compared to resection patients (100 vs. 69.5 %, p = 0.04), but no difference was seen in the ITT model. In the multivariate Cox proportional hazards model, inclusive of age, sex, ethnicity, tumor stage, and MELD era (pre-MELD vs. post-MELD), treatment with resection was an independent predictor of poorer survival (HR 2.72; 95 % CI, 1.08-6.86).Transplant-eligible HCC patients who received LT had significantly better survival than those treated with resection, suggesting that patients who can successfully remain on LT listing and actually undergo LT have better outcomes.

    View details for DOI 10.1007/s10620-013-2947-8

    View details for Web of Science ID 000330585500029

  • Review article: the epidemiology and therapy of chronic hepatitis C genotypes 4, 5 and 6 ALIMENTARY PHARMACOLOGY & THERAPEUTICS Wantuck, J. M., Ahmed, A., Nguyen, M. H. 2014; 39 (2): 137-147


    The global burden of hepatitis C (HCV) infection is mostly found in Africa, the Middle East and Asia, where HCV genotypes 4, 5 and 6 are common. The literature on these genotypes is sparse and this synopsis will review characteristics of patients infected with these genotypes.To review characteristics of patients infected with HCV genotypes 4, 5 and 6.PubMed search for 'hepatitis C' AND 'genotype 4', 'hepatitis C' AND 'genotype 5', and 'hepatitis C' AND 'genotype 6' was conducted and relevant articles were reviewed.Intravenous drug use is generally responsible for HCV genotype 4 infection in developed countries, but unsafe medical practices cause most cases of HCV genotypes 4, 5 and 6 in endemic countries. The sustained virological response (SVR) rate for patients with HCV genotype 4 who receive pegylated interferon and ribavirin for 48 weeks ranges from 40% to 70% in various small studies. The SVR rate is in the 60-70% range for HCV genotype 5 and 70-80% range for HCV genotype 6 following 48 weeks with pegylated interferon and ribavirin. Preliminary data suggest that a shorter course of 24 weeks of pegylated interferon and ribavirin may be acceptable for HCV genotype 6, with an SVR rate of approximately 70%.The current standard-of-care therapy for HCV genotypes 4, 5 and 6 is pegylated interferon and ribavirin for 48 weeks. A shorter course with 24 weeks of therapy may be considered for patients with genotype 6. Newer and much more effective therapies may be forthcoming in the next few years.

    View details for DOI 10.1111/apt.12551

    View details for Web of Science ID 000328283900003

  • Clinical Presentation and Survival of Asian and Non-Asian Patients with HCV-Related Hepatocellular Carcinoma DIGESTIVE DISEASES AND SCIENCES Yip, B., Wantuck, J. M., Kim, L. H., Wong, R. J., Ahmed, A., Garcia, G., Nguyen, M. H. 2014; 59 (1): 192-200


    Hepatitis C virus (HCV) is an important cause of hepatocellular carcinoma (HCC) in Asians; however, it is often overlooked due to the high prevalence of hepatitis B virus in Asians. This study examines HCV-related HCC in Asians.We conducted a retrospective cohort study of 792 consecutive Asian (n = 220) and non-Asian (n = 572) patients with HCV-related HCC identified at Stanford University Medical Center using International Classification of Diseases-9 diagnosis between July 1996 and June 2012.Asian patients were much older [66 (38-88) vs. 56 (31-87) years, P < 0.0001] and more likely to be female (33 vs. 19 %, P < 0.0001). A larger proportion of Asians were diagnosed with HCC within 2 years of HCV diagnosis (35 vs. 20 %, P = 0.001). Asian patients were more likely to undergo palliative therapy (46 vs. 28 %) and less likely to be listed for liver transplantation (20 vs. 48 %, P < 0.001), despite similar rates of meeting Milan criteria (52 vs. 58 %, P = 0.16). Overall, there was a trend for higher median survival rates in Asians (30 vs. 21 months, P = 0.091). Asians had higher long-term survival with palliative therapy only (5-year survival: 28 vs. 10 %, P < 0.0001); however, survival was similar among patients listed for liver transplantation.There were distinct differences in clinical presentations of Asian and non-Asian patients with HCV-related HCC. Asians with HCV-related HCC are less likely to undergo liver transplantation and more likely to have delayed HCV diagnosis. Improved strategies in HCV screening in Asians are needed, as it may lead to earlier diagnosis and treatment of HCV infection and possible prevention of HCC development.

    View details for DOI 10.1007/s10620-013-2948-7

    View details for Web of Science ID 000330585500030

    View details for PubMedID 24282055

  • Both HCV and HBV are Major Causes of Liver Cancer in Southeast Asians JOURNAL OF IMMIGRANT AND MINORITY HEALTH Lin, H., Ha, N. B., Ahmed, A., Ayoub, W., Daugherty, T. J., Lutchman, G. A., Garcia, G., Nguyen, M. H. 2013; 15 (6): 1023-1029


    The incidence of hepatocellular carcinoma (HCC) is higher in Asian Americans than in other ethnicities. While hepatitis B virus (HBV) is common, hepatitis C virus (HCV) is more prevalent in some subgroups. Our goal was to determine the etiology of liver disease associated with HCC in subgroups of Asian Americans. This was an analysis of 510 Asian HCC patients at a US medical center. Patients were identified using ICD9 diagnosis. Multivariate logistic regression was used to study predictors of HCV as the cause of HCC. Patients were Southeast Asian, Chinese, and Korean, with similar gender, age, and foreign-born status. Southeast Asians had a similar proportion of HBV- and HCV-related HCC, while Chinese and Korean patients had a higher proportion of HBV-related HCC. HCC was usually associated with HBV in Chinese and Korean patients, but both HCV and HBV were important associations in Southeast Asians.

    View details for DOI 10.1007/s10903-013-9871-z

    View details for Web of Science ID 000326888100003

  • Low incidence of hepatitis B e antigen seroconversion in patients treated with oral nucleos(t)ides in routine practice. Journal of gastroenterology and hepatology Lin, B., Ha, N. B., Liu, A., Trinh, H. N., Nguyen, H. A., Nguyen, K. K., Ahmed, A., Keeffe, E. B., Garcia, R. T., Garcia, G., Nguyen, M. H. 2013; 28 (5): 855-860


    Treatment end-point of therapy for patients with hepatitis B e antigen (HBeAg)-positive chronic hepatitis B (CHB) includes HBeAg seroconversion, which ranges from 15% to 22% after 1 year of oral nucleos(t)ides according to clinical trials. Our goal was to determine the incidence and predictors of HBeAg seroconversion in such patients in routine clinical practice because they may differ than reported rates.We conducted a retrospective cohort study of 333 consecutive treatment-naïve HBeAg-positive patients who were treated for CHB between 1/2000 and 6/2010 at three gastroenterology and liver clinics in the USA. Primary study end-point was HBeAg seroconversion-loss of HBeAg and antibody to HBeAg (anti-HBe) development.The majority of patients were Asian (96%). Median treatment duration prior to HBeAg seroconversion was 50 (range 26-52) weeks. Of the 333 study patients, 25% received lamivudine, 16% adefovir, 51% entecavir, and 8% tenofovir. HBeAg seroconversion at month 12 was 8.2%. On multivariate analysis inclusive of age, gender, and antiviral agents, independent predictors for HBeAg seroconversion at month 12 were hepatitis B virus DNA ?1.5?×?upper normal limit (HR?=?2.86 [1.05-7.81], P?=?0.040), but not the choice of nucleos(t)ides.The HBeAg seroconversion rate seen in clinical settings for oral nucleos(t)ides appears much lower than those reported in pivotal trials, especially in patients with lower ALT and higher HBV DNA levels. HBeAg-positive patients should be counseled about the high possibility of the long treatment duration required to achieve recommended treatment end-points.

    View details for DOI 10.1111/jgh.12108

    View details for PubMedID 23278507

  • Low hepatitis B envelope antigen seroconversion rate in chronic hepatitis B patients on long-term entecavir 0.5 mg daily in routine clinical practice EUROPEAN JOURNAL OF GASTROENTEROLOGY & HEPATOLOGY Liu, A., Ha, N. B., Lin, B., Yip, B., Trinh, H. N., Nguyen, H. A., Nguyen, K. K., Ahmed, A., Garcia, G., Nguyen, M. H. 2013; 25 (3): 338-343


    Data from registration trials with highly selective patients have shown that hepatitis B envelope antigen (HBeAg)-positive patients with chronic hepatitis B respond well to entecavir (ETV) 0.5 mg daily, with an HBeAg seroconversion rate of 21% at 12 months. However, there are varying data on the treatment outcomes of ETV 0.5 mg daily in routine clinical settings, with seroconversion rates at 12 months ranging from 8 to 48% in studies limited to 44-90 patients from centers in Asia, Europe, and South America.In the present study, we examined long-term treatment efficacy and tolerability in 136 consecutive treatment-naive HBeAg-positive chronic hepatitis B patients treated between January 2005 and January 2011 with ETV 0.5 mg daily at community clinics and tertiary centers in the USA. The primary study end point was HBeAg seroconversion.Sixty-one percent of HBeAg-positive patients were men, mean age 39 ± 12 years, median hepatitis B virus DNA 7.48 (3.7-9.8) log10 IU/ml, median alanine aminotransferase 67 (14-1077) U/l, and median treatment duration 18 (6-60) months. At months 12, 24, and 36, complete viral suppression rates were 41, 66, and 85% and HBeAg seroconversion rates were 4.8, 20, and 30%, respectively. No patients experienced adverse events or developed genotypic resistance to ETV.In clinical settings, ETV is highly tolerable and potent at suppressing hepatitis B viremia; however, the rates of HBeAg seroconversion appear to be much lower than those reported, highlighting the importance of appropriate counseling and planning for long-term therapy.

    View details for DOI 10.1097/MEG.0b013e32835b3677

    View details for Web of Science ID 000314633700011

  • Precore and basal core promoter mutations in Asian American patients with hepatitis B e antigen-positive chronic hepatitis B ALIMENTARY PHARMACOLOGY & THERAPEUTICS VuTien, P., Trinh, H. N., Nguyen, K., Garcia, R. T., Nguyen, H. A., Levitt, B. S., Nguyen, L., Ha, N. B., Ahmed, A., Daugherty, T., Garcia, G., Nguyen, M. H. 2013; 37 (4): 464-472


    Prior studies have shown that precore mutations abolish and basal core promoter (BCP) mutations down-regulate hepatitis B e antigen (HBeAg) production. Thus, the presence of precore and BCP mutations in HBeAg-positive patients indicates an infection with a mixed viral population of wild-type and precore and/or BCP mutant hepatitis B virus (HBV). To date, there has been limited study of the prevalence and clinical significance of precore and BCP mutations in patients with HBeAg-positive chronic hepatitis B.To determine the prevalence, predictors and clinical characteristics of mixed wild-type and precore/BCP HBV infection, through a cross-sectional study, in a US cohort of patients with chronic hepatitis B.We conducted a retrospective study of 828 chronic hepatitis B patients with HBV genotype and mutation panel testing seen at three US gastroenterology and liver clinics from June 2005 to September 2009.A majority of our patients (92.3%) were either Vietnamese or Chinese American. In the HBeAg-positive cohort, 17% of patients had precore mutations only, 28% had BCP mutations only and 5% had both BCP and precore mutations. On multivariate analyses, HBV genotype C, increasing age, lower HBV DNA level and an ALT quotient >2 were independent predictors for the presence of precore and/or BCP mutations.The current distinction and management recommendations for HBeAg-positive vs. HBeAg-negative patients with chronic hepatitis B should be reassessed. Additional biomarkers and treatment endpoints should be studied for their usefulness in predicting continued viral suppression after treatment discontinuation.

    View details for DOI 10.1111/apt.12193

    View details for Web of Science ID 000313891900011

    View details for PubMedID 23278246

  • Donor Diabetes Mellitus Is an Independent Risk Factor for Graft Loss in HCV Positive but Not HCV Negative Liver Transplant Recipients DIGESTIVE DISEASES AND SCIENCES Wu, Y., Ahmed, A., Kamal, A. 2013; 58 (2): 574-578


    Graft survival in HCV (hepatitis C virus) infected recipients is worse than those transplanted for other liver diseases. We studied whether several donor cardiovascular risk factors (including advanced age, smoking, hypertension, and diabetes mellitus) contribute to worse outcomes for HCV positive and HCV negative liver transplant recipients.We obtained data from the United Network for Organ Sharing on all adult liver transplants performed in the United States between January 1, 1998 and December 31, 2003. In total, 27,033 transplant cases were evaluated. Independent predictors of graft survival were determined using Cox proportional hazards regression analysis after controlling for factors previously found to be associated with differences in transplant outcomes.Donor diabetes was a strong independent risk factor for graft failure [hazard ratio (HR) = 1.20, p = 0.006] only in HCV positive recipients. Neither donor smoking status nor hypertension predicted graft loss in either cohort. Consistent with previous studies, advanced donor age, donation after cardiac death, height, and African American donor all predicted graft loss amongst both cohorts.Accounting for donor diabetes in relation to recipient HCV status in the selection of liver recipients may result in improved graft survival.

    View details for DOI 10.1007/s10620-012-2345-7

    View details for Web of Science ID 000315291100039

    View details for PubMedID 22923335

  • Commentary: physical activity and NAFLD - cause or effect? ALIMENTARY PHARMACOLOGY & THERAPEUTICS Ahmed, A., Forrest, E. H. 2012; 36 (11-12): 1097-1098

    View details for DOI 10.1111/apt.12078

    View details for Web of Science ID 000310871000014

    View details for PubMedID 23130768

  • Incidence of Hepatocellular Carcinoma Among US Patients With Cirrhosis of Viral or Nonviral Etiologies CLINICAL GASTROENTEROLOGY AND HEPATOLOGY Mair, R. D., Valenzuela, A., Ha, N. B., Ayoub, W. S., Daugherty, T., Lutchman, G. A., Garcia, G., Ahmed, A., Nguyen, M. H. 2012; 10 (12): 1412-1417


    We aimed to identify risk factors for hepatocellular carcinoma (HCC) in patients with cirrhosis in the United States. We performed a prospective study to identify associations between etiologies of cirrhosis and ethnicity with HCC incidence.We used convenience sampling to select a cohort of 379 patients with cirrhosis who visited the liver clinic at the Stanford University Medical Center from 2001 to 2009 (65% male, 75% white or Hispanic, and 20% Asian). Study end points were HCC diagnosis by histology or noninvasive criteria, liver transplantation, or last screening without HCC. Patients were followed up, with ultrasound or computed tomographic imaging analyses and measurements of serum levels of ?-fetoprotein, approximately every 6 months, for a median time of 34 months (range, 6-99 mo).The etiologies of cirrhosis in the cohort were 68% hepatitis C, 7% hepatitis B, and 25% nonviral. Forty-four patients (12%) were diagnosed with HCC during the follow-up period. Patients with cirrhosis related to viral hepatitis had a statistically significantly higher incidence of HCC than those with nonviral diseases in Kaplan-Meier analysis (P = .04). There was no statistically significant difference in HCC incidence between Asian and non-Asian patients. In a multivariate Cox proportional hazards model that included age, sex, ethnicity, etiology, and Child-Pugh-Turcotte score, viral cirrhosis was associated significantly with HCC, compared with nonviral cirrhosis (hazard ratio, 3.6; 95% confidence interval, 1.3-10.1; P = .02) but Asian ethnicity was not.In a diverse cohort of patients in the United States with cirrhosis, a viral etiology of cirrhosis was associated with increased incidence of HCC, but Asian ethnicity was not. These findings indicate the importance of cirrhosis etiology in determining risk for HCC.

    View details for DOI 10.1016/j.cgh.2012.08.011

    View details for Web of Science ID 000312265900021

    View details for PubMedID 22902757

  • High Frequency of Recurrent Viremia After Hepatitis B e Antigen Seroconversion and Consolidation Therapy JOURNAL OF CLINICAL GASTROENTEROLOGY Chaung, K. T., Ha, N. B., Trinh, H. N., Garcia, R. T., Nguyen, H. A., Nguyen, K. K., Garcia, G., Ahmed, A., Keeffe, E. B., Nguyen, M. H. 2012; 46 (10): 865-870


    The primary treatment endpoint for hepatitis B e antigen (HBeAg)-positive chronic hepatitis B is HBeAg seroconversion; however, data on the durability of response are inconsistent.Our goal was to investigate the rate of recurrent viremia after HBeAg seroconversion and subsequent discontinuation of therapy.We retrospectively studied 88 consecutive Asian American patients who achieved HBeAg seroconversion [loss of HBeAg and development of antibody to HBeAg (anti-HBe)] among 458 HBeAg-positive patients who received oral antiviral therapy at 3 US clinics between March 1998 and November 2010. Recurrent viremia was defined as reappearance of detectable serum hepatitis B virus DNA (>100 IU/mL) on 2 consecutive laboratory tests from previously undetectable levels.Antiviral medications used at the time of HBeAg seroconversion included: lamivudine (23%), adefovir (34%), entecavir (36%), tenofovir (4%), and combination therapy (3%). Antiviral therapy was continued after HBeAg seroconversion in 49 patients (group I) and discontinued in the other 39 patients after consolidation therapy [median=12 months (range, 1 to 55 mo)] (group II). No patients in group I experienced recurrent viremia, whereas 90% in group II did. Elevated alanine aminotransferase also occurred in 38% of group II patients [median peak alanine aminotransferase 249 IU/mL (range, 93 to 1070 IU/mL)].Despite consolidation therapy, almost all patients who discontinued therapy after achieving HBeAg seroconversion and complete viral suppression experienced recurrent viremia, and close to half also experienced biochemical flares. HBeAg seroconversion does not seem to be a durable treatment endpoint for many patients, and they should be monitored carefully for virologic relapse and biochemical flares if antiviral therapy is withdrawn.

    View details for DOI 10.1097/MCG.0b013e31825ceed9

    View details for Web of Science ID 000312953400018

    View details for PubMedID 22941429

  • Tenofovir Monotherapy and Tenofovir Plus Entecavir Combination as Rescue Therapy for Entecavir Partial Responders DIGESTIVE DISEASES AND SCIENCES Yip, B., Chaung, K., Wong, C. R., Trinh, H. N., Nguyen, H. A., Ahmed, A., Cheung, R., Nguyen, M. H. 2012; 57 (11): 3011-3016


    Despite high potency, a significant proportion of patients treated with entecavir achieve only partial viral suppression. Our goal was to examine the complete viral suppression rate (undetectable HBV DNA PCR levels) with alternative therapies in such patients.We retrospectively studied 42 consecutive patients with partial response to entecavir (detectable HBV DNA at ?12 months of therapy) who were treated at three clinics with rescue therapies: entecavir + adefovir (n = 5), tenofovir (n = 6), and entecavir + tenofovir (n = 31). Antiviral resistance was excluded by negative mutation analysis and/or absence of virologic breakthrough (increase >1 log(10)IU/mL from nadir).All patients were Asian and 57 % were male with a median age of 36 (22-64) years. Only a few patients had prior exposure to lamivudine (7 %) or adefovir (7 %). Almost all patients (95 %) had positive HBeAg. Overall, the complete viral suppression rate was 79 %, and the alanine aminotransferase normalization rate was 83 % in entecavir partial responders after 6 months on rescue therapies. Cumulative complete viral suppression rates were significantly different (P = 0.0164) among the entecavir + adefovir, tenofovir, and entecavir + tenofovir treatment groups at 6 months (20 vs. 83 vs. 83 %, respectively) and 12 months (20 vs. 100 vs. 97 %). All three patients without complete viral suppression on entecavir + adefovir became aviremic 6 months after switching to entecavir + tenofovir.Virologic response to entecavir + tenofovir combination therapy and tenofovir monotherapy appeared to be similar in most patients, but not with the entecavir + adefovir combination.

    View details for DOI 10.1007/s10620-012-2402-2

    View details for Web of Science ID 000309867800051

    View details for PubMedID 23010744

  • Risk factors for hepatocellular carcinoma in patients with chronic liver disease: a case-control study CANCER CAUSES & CONTROL Ha, N. B., Ha, N. B., Ahmed, A., Ayoub, W., Daugherty, T. J., Chang, E. T., Lutchman, G. A., Garcia, G., Cooper, A. D., Keeffe, E. B., Nguyen, M. H. 2012; 23 (3): 455-462


    The majority of data on risk factors (RFs) for hepatocellular carcinoma (HCC) comes from studies involving populations without underlying liver disease. It is important to evaluate RFs for HCC in patients with chronic liver disease since HCC rarely occurs in those without underlying liver disease. We conducted a hospital-based case-control study of 259 incident HCC cases and 781 controls by convenience sampling between 02/2001 and 12/2009 from the liver clinic at Stanford University Medical Center. The study population was 41% White, 14% Hispanic, 3% African American, 40% Asian American, and 2% other race/ethnicity. RFs were examined through medical records and an in-person questionnaire. Alcohol and tobacco use was calculated by cumulative grams of alcohol or cumulative pack(s) of cigarette consumed over one's lifetime. Diabetes mellitus (DM) was defined by random glucose level of ?200 mg/dL. RFs were evaluated using multivariate logistic regression. Independent predictors of HCC risk, after mutual adjustment and additional control for alcohol use, etiology of liver diseases, and DM, included age >40 (OR = 8.5 [2.6-28.3]), male gender (OR = 3.5 [2.2-5.8]), presence of cirrhosis (OR = 2.8 [1.6-4.9]), Asian ethnicity (OR = 2.8 [1.8-4.6]), AFP > 50 (OR = 4.2 [2.6-6.8]), and cumulative lifetime tobacco use of >11,000 packs (OR = 1.7 [1.0-2.9]). Heavy prolonged cigarette smoking, but not alcohol use, was a significant independent predictor for HCC in patients with underlying liver disease. Besides older age, male gender, presence of cirrhosis, and elevated AFP, Asian ethnicity and heavy cumulative tobacco use are strong independent predictors of HCC.

    View details for DOI 10.1007/s10552-012-9895-z

    View details for Web of Science ID 000300891100006

    View details for PubMedID 22258434

  • Outcomes after escalation of infliximab therapy in ambulatory patients with moderately active ulcerative colitis ALIMENTARY PHARMACOLOGY & THERAPEUTICS Rostholder, E., Ahmed, A., Cheifetz, A. S., Moss, A. C. 2012; 35 (5): 562-567


    Infliximab (IFX) therapy escalation during maintenance treatment occurs frequently in clinical practice in patients with ulcerative colitis (UC). Outcomes for these patients have not been described.To describe the prevalence of, and outcomes after, IFX escalation during maintenance therapy in patients with moderate-severe UC.Retrospective observational study of clinical outcomes in ambulatory patients with moderate-severe UC treated with maintenance IFX.Fifty-six ambulatory patients received IFX for moderate-severe UC; fifty (89%) responded and proceeded to maintenance therapy. Mean duration of maintenance therapy was 14 months, with mean follow-up of 38 months. Twenty-seven patients (54%) required IFX therapy escalation after a mean of six maintenance infusions. Clinical remission was noted in 36% of the entire cohort (18/50) at 12 months; 19% in the escalation group and 56% in the non-escalation group. Patients who required IFX escalation were less likely to be in clinical remission at 12 months (OR 0.2, 95% CI 0.1-0.6, P = 0.01) when compared with those who did not. During the follow-up period, 27% of patients required a colectomy, and the mean time to colectomy was 17 months. Patients in the escalation group required a colectomy in 33% of cases, compared with 21% of non-escalation patients.A significant proportion of ambulatory patients with UC treated with maintenance infliximab required therapy escalation over time. This was associated with lower remission, and higher colectomy, rates.

    View details for DOI 10.1111/j.1365-2036.2011.04986.x

    View details for Web of Science ID 000299832700007

    View details for PubMedID 22239070

  • Prospective study of risk factors for hepatitis C virus acquisition by Caucasian, Hispanic, and Asian American patients JOURNAL OF VIRAL HEPATITIS Ho, E. Y., Ha, N. B., Ahmed, A., Ayoub, W., Daugherty, T., Garcia, G., Cooper, A., Keeffe, E. B., Nguyen, M. H. 2012; 19 (2): E105-E111


    Commonly known risk factors for infection with hepatitis C virus (HCV) include blood transfusion, injection drug use, intranasal cocaine use, and body tattoos. We hypothesized that Asian Americans infected with HCV may not identify with these established risk factors present in Caucasians and Hispanics, and our aim was to conduct a survey of risk factors in HCV-infected patients in these ethnic groups. In this prospective study, 494 patients infected with HCV completed a detailed risk assessment questionnaire at a liver centre in Northern California from 2001 to 2008. Among subjects participating in this study, 55% identified themselves as Caucasian, 20% as Hispanic, and 25% as Asian. Asian Americans were older, less likely to smoke or consume alcohol, and have a family history of cancer compared with Caucasians and Hispanics. The laboratory profiles were similar, and genotype 1 was the most common infection in all groups (74-75%). The great majority of Caucasians (94%) and Hispanics (86%) identified with commonly known risk factors, which was in contrast to 67% of Asians (P < 0.0001). The most common risk factors in Asians were blood transfusions (50%) and acupuncture (50%). Furthermore, 74% of Caucasians and 66% of Hispanics identified more than one major risk factor, while only 20% of Asians reported having more than one risk factor (P < 0.0001). Survey for established risk factors for acquisition of HCV may be more appropriate for risk assessment of Caucasians and Hispanics, but not for Asian Americans. These findings may guide the development of HCV screening in our increasingly diverse population.

    View details for DOI 10.1111/j.1365-2893.2011.01513.x

    View details for Web of Science ID 000299097400014

    View details for PubMedID 22239506

  • Comparison of the Frequency of Coronary Artery Disease in Alcohol-Related Versus Non-Alcohol-Related Endstage Liver Disease AMERICAN JOURNAL OF CARDIOLOGY Patel, S., Kiefer, T. L., Ahmed, A., Ali, Z. A., Tremmel, J. A., Lee, D. P., Yeung, A. C., Fearon, W. F. 2011; 108 (11): 1552-1555


    There are conflicting data as to the prevalence of coronary artery disease (CAD) in patients with end-stage liver disease (ESLD) being assessed for liver transplantation (LT). The aims of this study were to compare the prevalence of CAD in patients with alcohol-related versus non-alcohol-related ESLD and to assess the diagnostic utility of dobutamine stress echocardiography (DSE) in predicting angiographically important CAD. Consecutive patients with ESLD being assessed for LT (n = 420, mean age 56 ± 8 years) were identified and divided into groups of those with alcohol-related ESLD (n = 125) and non-alcohol-related ESLD (n = 295). Demographic characteristics, CAD risk factors, results of DSE, and coronary angiographic characteristics were recorded. There were no significant differences in age or CAD risk factors between groups. The incidence of severe CAD (>70% diameter stenosis) was 2% in the alcohol-related ESLD group and 13% in the non-alcohol-related ESLD group (p <0.005). In the 2 groups, the presence of ?1 CAD risk factor was associated with significant CAD (p <0.05 for all). Absence of cardiac risk factors was highly predictive in ruling out angiographically significant disease (negative predictive value 100% for alcohol-related ESLD and 97% for non-alcohol-related ESLD). DSE was performed in 205 patients. In the 2 groups, DSE had poor predictive value for diagnosing significant CAD but was useful in ruling out patients without significant disease (negative predictive value 89% for alcohol-related ESLD and 80% for non-alcohol-related ESLD). In conclusion, there was a significantly lower prevalence of severe CAD in patients with alcohol-related ESLD. These findings suggest that invasive coronary angiography may not be necessary in this subgroup, particularly in the absence of CAD risk factors and negative results on DSE.

    View details for DOI 10.1016/j.amjcard.2011.07.013

    View details for Web of Science ID 000297880000006

    View details for PubMedID 21890080

  • High Rate of Complete Viral Suppression With Combination Therapy in Patients With Chronic Hepatitis B and Prior Treatment Failure JOURNAL OF CLINICAL GASTROENTEROLOGY Wong, C. R., Trinh, H. N., Yip, B., Nguyen, H. A., Garcia, R. T., Ahmed, A., Keeffe, E. B., Nguyen, M. H. 2011; 45 (10): 900-905


    Combination therapy for chronic hepatitis B virus (HBV) infection is recommended for patients with antiviral resistance (AVR) or partial response (PR) to earlier antiviral therapy; however, data on outcomes are limited.To determine the rate of complete viral suppression (CVS) with combination therapy and to compare CVS among different indications and treatment regimens.A cohort of 109 consecutive patients with chronic hepatitis B from 3 liver clinics in Northern California was retrospectively studied. All patients started combination therapy between April 2004 and August 2009 for the following indications: AVR (n = 29), PR (n = 60), or others (n = 20). Combination treatments included lamivudine (LAM), adefovir (ADV), telbivudine (LdT), entecavir (ETV), tenofovir (TDF), and emtricitabine (FTC). CVS was defined as undetectable serum HBV DNA <100 IU/mL.Among the patients, who were nearly all Asian (99%), 73% had ? 2 prior treatments and 82% had treatment failure (AVR or PR). Median treatment duration of combination therapy was 21 months (range, 6 to 50 mo). The majority (77%) achieved CVS after 6 months of various combination regimens: 80% for ETV+TDF, 76% for TDF+LAM or FTC or LdT, 75% for ETV+ADV, and 69% for ADV+LAM or LdT (P = 0.86). After 6 months of therapy, CVS was observed in a similar proportion of patients treated for PR and AVR (72% and 74%, respectively).Although the majority of 109 treatment-experienced patients had prior treatment failure, high rates of CVS were rapidly achieved and did not significantly differ between indications of AVR and PR or between ETV-based and TDF-based regimens.

    View details for DOI 10.1097/MCG.0b013e318224d64f

    View details for Web of Science ID 000296144000014

    View details for PubMedID 21778896

  • Ethnic Differences in Viral Dominance Patterns in Patients with Hepatitis B Virus and Hepatitis C Virus Dual Infection HEPATOLOGY Nguyen, L. H., Ko, S., Wong, S. S., Tran, P. S., Trinh, H. N., Garcia, R. T., Ahmed, A., Lutchman, G. A., Keeffe, E. B., Nguyen, M. H. 2011; 53 (6): 1839-1845


    Studies of hepatitis B virus (HBV)/hepatitis C virus (HCV) dual infection are limited. Most are small, conducted outside the United States, and compare dual infection with HCV monoinfection. The goal of this study was to characterize HBV/HCV dual infection in a large multiethnic, matched, case-control study of dual-infected and HBV-monoinfected patients at two United States centers. Using an International Classification of Disease Version 9 electronic query and chart review, we identified 115 HBV/HCV dual-infected patients with serial HBV DNA, HCV RNA, and alanine aminotransferase (ALT) levels. As a control, 115 HBV-monoinfected patients were chosen randomly and matched with cases by age ±10 years, sex, Asian versus non-Asian ethnicity, and study site. Both groups had similar sex, ethnic, and age distributions (68% male, 83% Asian, age 52 ± 14 years). The median follow-up times were 33 and 38 months for the dual-infected and monoinfected groups, respectively. More monoinfected patients received HBV antiviral therapy than dual-infected patients (43% versus 24%; P = 0.002). No significant difference was detected between the proportion of monoinfected versus dual-infected patients with ALT above 40 U/L at presentation or during follow-up. Dual infection patients exhibited very little HBV/HCV codominance at baseline and throughout follow-up: patients had either HBV viremia with low or absent HCV RNA or detectable HCV RNA with low or absent HBV DNA. Asian ethnicity was predictive of HBV dominance after adjusting for sex, age, and baseline ALT elevation (odds ratio 7.35; P = 0.01).HBV/HCV dual-infected and HBV-monoinfected patients had similar clinical characteristics. Asian ethnicity is a major independent predictor of HBV-dominant disease, and HCV dominance with undetectable HBV DNA is more common in non-Asian individuals. Larger studies are needed to further characterize the natural history of HBV/HCV dual infection in Asian and non-Asian individuals.

    View details for DOI 10.1002/hep.24308

    View details for Web of Science ID 000291307300009

    View details for PubMedID 21425314

  • Diabetes Mellitus Increases the Risk of Mortality Following Liver Transplantation Independent of MELD Score DIGESTIVE DISEASES AND SCIENCES Samuelson, A. L., Lee, M., Kamal, A., Keeffe, E. B., Ahmed, A. 2010; 55 (7): 2089-2094


    Patients with diabetes mellitus overall experience worse health outcomes than non-diabetics, but whether this is true among recipients of liver transplantation still remains unclear. The aim of this study was to compare the mortality of diabetic and non-diabetic patients following liver transplantation.We conducted a retrospective analysis of 530 adult patients undergoing liver transplantation at Stanford University Medical Center from February 1995 to July 2006. Information on diabetes mellitus was available for 431 patients; 96 patients who had acute liver failure (n = 17), combined liver and kidney transplantation (n = 28), or died prior to discharge (n = 51) were excluded from analysis.Over a mean follow-up of 4.5 years, survival was 81% in the diabetic group and 94% among controls (p = <0.0001). After controlling for age (mean +/- SD: 54.4 +/- 7.6 in diabetics, 50.1 +/- 9.6 in controls), body mass index (28.6 +/- 6.6 in diabetics, 27.1 +/- 5.4 in controls), presence of hepatitis C, and MELD score (17 +/- 9.6 in diabetics, 19 +/- 10.2 in controls), diabetes mellitus remained a significant predictor of death (HR 3.11, p = 0.01).Diabetes mellitus is an independent risk factor for mortality following liver transplantation. Further investigation of this relationship should focus on the impact of more intensive pre- and post-liver transplantation glucose control, cardiovascular risk factor reduction, and the effects of accelerated atherosclerosis in the setting of immune suppression.

    View details for DOI 10.1007/s10620-010-1267-5

    View details for Web of Science ID 000278900200039

    View details for PubMedID 20467898

  • Pseudomyxoma Peritonei Masquerading As Ascites Secondary to Alcoholic Cirrhosis DIGESTIVE DISEASES AND SCIENCES Nguyen, T., Ahmed, A. 2009; 54 (10): 2053-2055

    View details for DOI 10.1007/s10620-009-0881-6

    View details for Web of Science ID 000269531900001

    View details for PubMedID 19575292

  • Transarterial Chemoinfusion for Hepatocellular Carcinoma as Downstaging Therapy and a Bridge toward Liver Transplantation AMERICAN JOURNAL OF TRANSPLANTATION De Luna, W., Sze, D. Y., Ahmed, A., Ha, B. Y., Ayoub, W., Keeffe, E. B., Cooper, A., Esquivel, C., Nguyen, M. H. 2009; 9 (5): 1158-1168


    Favorable outcomes after liver transplantation (LT) in patients with hepatocellular carcinoma (HCC) are well described for patients who fall within defined tumor criteria. The effectiveness of tumor therapies to maintain tumor characteristics within these criteria or to downstage more advanced tumors to fall within these criteria is not well understood. The aim of this study was to examine the response to transcatheter arterial chemoinfusion (TACI) in HCC patients awaiting LT and its efficacy for downstaging or bridging to transplantation. We performed a retrospective study of 248 consecutive TACI cases in 122 HCC patients at a single U.S. medical center. Patients were divided into two groups: those who met the Milan criteria on initial HCC diagnosis (n = 95) and those with more advanced disease (n = 27). With TACI treatment, 87% of the Milan criteria group remained within the Milan criteria and 63% of patients with more advanced disease were successfully downstaged to fall within the Milan criteria. In conclusion, TACI appears to be an effective treatment as a bridge to LT for nearly 90% patients presenting within the Milan criteria and an effective downstaging modality for over half of those whose tumor burden was initially beyond the Milan criteria.

    View details for DOI 10.1111/j.1600-6143.2009.02576.x

    View details for Web of Science ID 000265222200023

    View details for PubMedID 19344435

  • The Asymptomatic Outpatient with Abnormal Liver Function Tests CLINICS IN LIVER DISEASE Krier, M., Ahmed, A. 2009; 13 (2): 167-?


    Traditionally, the constellation of biochemistry tests including liver enzymes, total bilirubin, and hepatic synthetic measures (prothrombin time (PT) and serum albumin level) are referred to as liver function tests (LFTs). Abnormal LFTs can be encountered during primary health care visits, routine blood donation, and insurance screening. A reported 1% to 4% of asymptomatic patients exhibit abnormal LFTs, leading to a sizeable number of annual consultations to a gastroenterology and/or hepatology practice. A cost-effective and systematic approach is essential to the interpretation of abnormal LFTs. A review of pattern of abnormal LFTs, detailed medical history, and a comprehensive physical examination help establish a foundation for further individualized testing. Further investigation often involves biochemical testing for disease-specific markers, radiographic imaging, and even consideration of a liver biopsy. In the following account, markers of hepatic injury are reviewed followed by a discussion on an approach to various patterns of abnormal LFTs in an asymptomatic patient.

    View details for DOI 10.1016/j.cld.2009.02.001

    View details for Web of Science ID 000267207200002

    View details for PubMedID 19442912

  • Ultra-Deep Pyrosequencing of Hepatitis B Virus Quasispecies from Nucleoside and Nucleotide Reverse-Transcriptase Inhibitor (NRTI)-Treated Patients and NRTI-Naive Patients JOURNAL OF INFECTIOUS DISEASES Margeridon-Thermet, S., Shulman, N. S., Ahmed, A., Shahriar, R., Liu, T., Wang, C., Holmes, S. P., Babrzadeh, F., Gharizadeh, B., Hanczaruk, B., Simen, B. B., Egholm, M., Shafer, R. W. 2009; 199 (9): 1275-1285


    The dynamics of emerging nucleoside and nucleotide reverse-transcriptase inhibitor (NRTI) resistance in hepatitis B virus (HBV) are not well understood because standard dideoxynucleotide direct polymerase chain reaction (PCR) sequencing assays detect drug-resistance mutations only after they have become dominant. To obtain insight into NRTI resistance, we used a new sequencing technology to characterize the spectrum of low-prevalence NRTI-resistance mutations in HBV obtained from 20 plasma samples from 11 NRTI-treated patients and 17 plasma samples from 17 NRTI-naive patients, by using standard direct PCR sequencing and ultra-deep pyrosequencing (UDPS). UDPS detected drug-resistance mutations that were not detected by PCR in 10 samples from 5 NRTI-treated patients, including the lamivudine-resistance mutation V173L (in 5 samples), the entecavir-resistance mutations T184S (in 2 samples) and S202G (in 1 sample), the adefovir-resistance mutation N236T (in 1 sample), and the lamivudine and adefovir-resistance mutations V173L, L180M, A181T, and M204V (in 1 sample). G-to-A hypermutation mediated by the apolipoprotein B mRNA editing enzyme, catalytic polypeptide-like family of cytidine deaminases was estimated to be present in 0.6% of reverse-transcriptase genes. Genotype A coinfection was detected by UDPS in each of 3 patients in whom genotype G virus was detected by direct PCR sequencing. UDPS detected low-prevalence HBV variants with NRTI-resistance mutations, G-to-A hypermutation, and low-level dual genotype infection with a sensitivity not previously possible.

    View details for DOI 10.1086/597808

    View details for Web of Science ID 000265035500007

    View details for PubMedID 19301976

  • Adenovirus-Induced Acute Liver Failure DIGESTIVE DISEASES AND SCIENCES Rothenberg, M., Cheung, R., Ahmed, A. 2009; 54 (2): 218-221

    View details for DOI 10.1007/s10620-008-0628-9

    View details for Web of Science ID 000262968200006

    View details for PubMedID 19034647

  • Management of Biliary Strictures Following Liver Transplantation DIGESTIVE DISEASES AND SCIENCES Alexopoulos, S. P., Henningsen, J. A., Jeffrey, R. B., Bonham, C. A., Ahmed, A., Gonzalez, S. A. 2009; 54 (1): 25-27

    View details for DOI 10.1007/s10620-008-0626-y

    View details for Web of Science ID 000261653400007

    View details for PubMedID 19034649

  • Prevalence of Colorectal Neoplasms in Asian Americans DIGESTIVE DISEASES AND SCIENCES Lam, K. D., Garcia, R. T., Nguyen, L. H., Trinh, H., Triadafilopoulos, G., Phan, J. T., Nguyen, K., Nguyen, H., Ahmed, A., Nguyen, M. H. 2009; 54 (1): 160-167


    To determine the yield of colonoscopy in a predominantly Asian American gastroenterology practice in California from 8/2003 to 2/2005.A total 2,723 subjects were included: 87% were Asian and 13% were non-Asian. Advanced neoplasia prevalence was 12% in Asian men and 9% in non-Asian men (P = 0.21), and 8% and 7% in women (P = 0.62). Similar results were found in asymptomatic patients (13% and 13%, P = 0.99, for men; 8% and 6%, P = 0.46, for women). Factors associated with presence of advanced neoplasia were total number of polyps and presence of right-sided lesions. Asian men were more likely to have neoplasia overall compared with non-Asian men with odds ratio (OR) of 2.14 (1.23-3.72); however, there were no significant differences in the prevalences of advanced neoplasia in the two groups.Colorectal neoplasia is as prevalent in Asian Americans and preventive guidelines for colorectal cancer should also be advocated for this ethnic group.

    View details for DOI 10.1007/s10620-008-0499-0

    View details for Web of Science ID 000261653400026

    View details for PubMedID 18975084

  • Bidirectionally Adjustable TIPS Reduction by Parallel Stent and Stent-Graft Deployment JOURNAL OF VASCULAR AND INTERVENTIONAL RADIOLOGY Sze, D. Y., Hwang, G. L., Kao, J. S., Frisoli, J. K., Kee, S. T., Razavi, M. K., Ahmed, A. 2008; 19 (11): 1653-1658


    Excessive shunting through transjugular intrahepatic portosystemic shunts (TIPS) can cause life-threatening hepatic encephalopathy and insufficiency. Intentional reduction of flow may be effective but difficult to control. The present report describes refinements of the parallel stent/stent-graft technique of flow reduction that is adjustable in either direction. Six patients underwent TIPS reduction with varying stent positioning and a variety of commercial products. Flow was adjusted by iterative balloon dilatation of the stent and stent-graft, resulting in a mean gradient increase of 8 mm Hg. All cases were technically successful, but 1-year survival was seen in only the patient who underwent liver transplantation.

    View details for DOI 10.1016/j.jvir.2008.08.011

    View details for Web of Science ID 000260694700018

    View details for PubMedID 18823797

  • Long-term survival of patients with unresectable hepatocellular carcinoma treated with transcatheter arterial chemoinfusion ALIMENTARY PHARMACOLOGY & THERAPEUTICS Ha, B. Y., Ahmed, A., Sze, D. Y., Razavi, M. K., Simpson, N., Keeffe, E. B., Nguyen, M. H. 2007; 26 (6): 839-846


    Transcatheter arterial chemoembolization (TACE) has become one of the most common treatments for unresectable hepatocellular carcinoma. Published studies of TACE report a 5-16% risk of serious complications. Compared with TACE, transcatheter arterial chemoinfusion (TACI) may have similar efficacy and fewer side effects.To examine the clinical outcomes of TACI.We performed a retrospective cohort study of 345 consecutive TACI cases in 165 patients performed at a single United States medical center between 1998 and 2002. Primary outcomes were tumour response and survival rates.Only seven patients were hospitalized for more than 24 h after the procedure, and only three patients had worsening of liver function within 30 days of TACI. Survival was significantly poorer for patients with tumour-node-metastasis (TNM) IV compared to those with TNM I-III and also for patients with Child's class B/C vs. A. Following adjustment for age, gender, ethnicity and aetiology of liver diseases, independent predictors of poor survival were Child's class B/C [Hazard Ratio (HR) = 1.69, P = 0.024] and TNM IV staging (HR = 1.63, P = 0.014).TACI appears to be safe and effective for unresectable hepatocellular carcinoma with TNM stage I-III; randomized controlled trials are needed to compare TACI to TACE.

    View details for DOI 10.1111/j.1365-2036.2007.03424.x

    View details for Web of Science ID 000249130100008

    View details for PubMedID 17767468

  • Current indications and contraindications for liver transplantation. Clinics in liver disease Ahmed, A., Keeffe, E. B. 2007; 11 (2): 227-247


    Survival rates after liver transplantation have improved steadily because of earlier referral and timely evaluation, judicious patient selection, improved surgical techniques, superior immunosuppressive regimens, and effective prevention of perioperative opportunistic infections. Indications and contraindications for liver transplantation are undergoing constant modifications with the goal of improving survival and functional status of patients who have end-stage liver disease or acute liver failure. Potential candidates for liver transplantation should meet minimal listing criteria and not have contraindications to liver transplantation. Currently, the Model for End-stage Liver Disease score is used for organ allocation, but it may have future application in patient-selection criteria.

    View details for PubMedID 17606204

  • Dermatologic disorders associated with chronic hepatitis C: Effect of interferon therapy CLINICAL GASTROENTEROLOGY AND HEPATOLOGY Berk, D. R., Bayliss Mallory, S., Keeffe, E. B., Ahmed, A. 2007; 5 (2): 142-151


    Chronic hepatitis C virus infection (HCV) is associated with extrahepatic manifestations, including such dermatologic conditions as mixed cryoglobulinemia, porphyria cutanea tarda, and lichen planus. Patients with chronic HCV and extrahepatic manifestations are often excluded from clinical trials evaluating interferon (IFN) therapy due to concerns about poor response, adverse events, and toxicity. Thus, data regarding the efficacy of IFN not only on the underlying chronic HCV, but also on extrahepatic manifestations, are limited in these patients. Case reports suggest that the response of dermatologic extrahepatic manifestations to IFN in patients with chronic HCV is highly variable. This review summarizes available data on dermatologic conditions associated with chronic HCV and their response to IFN therapy.

    View details for DOI 10.1016/j.cgh.2006.06.010

    View details for Web of Science ID 000244511700004

    View details for PubMedID 16919505

  • Global transcriptional response to interferon is a determinant of HCV treatment outcome and is modified by race HEPATOLOGY He, X., Ji, X., Hale, M. B., Cheung, R., Ahmed, A., Guo, Y., Nolan, G. P., Pfeffer, L. M., Wright, T. L., Risch, N., Tibshirani, R., Greenberg, H. B. 2006; 44 (2): 352-359


    Interferon (IFN)-alpha-based therapy for chronic hepatitis C is effective in fewer than 50% of all treated patients, with a substantially lower response rate in black patients. The goal of this study was to investigate the underlying host transcriptional response associated with interferon treatment outcomes. We collected peripheral blood mononuclear cells from chronic hepatitis C patients before initiation of IFN-alpha therapy and incubated the cells with or without IFN-alpha for 6 hours, followed by microarray assay to identify IFN-induced gene transcription. The microarray datasets were analyzed statistically according to the patients' race and virological responses to subsequent IFN-alpha treatment. The global induction of IFN-stimulated genes (ISGs) was significantly greater in sustained virological responders compared with nonresponders and in white patients compared with black patients. In addition, a significantly greater global induction of ISGs was observed in sustained virological responders compared with nonresponders within the group of white patients. The level of IFN-induced signal transducer and activator of transcription (STAT) 1 activation, a key component of the Janus kinase (JAK)-STAT signaling pathway, correlated with the global induction of ISGs and was significantly higher in white patients than in black patients. In conclusion, both treatment outcome and race are associated with different transcriptional responses to IFN-alpha. Because this difference is evident in the global induction of ISGs rather than a selective effect on a subset of such genes, key factors affecting the outcome of IFN-alpha therapy are likely to act at the JAK-STAT pathway that controls transcription of downstream ISGs.

    View details for DOI 10.1002/hep.21267

    View details for Web of Science ID 000239523200009

    View details for PubMedID 16871572

  • Progressive asymptomatic occlusion of a TIPS in a patient with Budd-Chiari syndrome JOURNAL OF VASCULAR AND INTERVENTIONAL RADIOLOGY Sze, D. Y., Frisoli, J. K., Macksood, D. J., Dovichi, E. A., Ahmed, A., Keeffe, E. B. 2006; 17 (4): 737-739
  • Portal, spienic, and superior mesenteric vein thrombosis in a patient with latent essential thrombocythemia and hyperhomocysteinemia JOURNAL OF CLINICAL GASTROENTEROLOGY Berk, D. R., Ahmed, A. 2006; 40 (3): 227-228

    View details for Web of Science ID 000236816600012

    View details for PubMedID 16633126

  • Endoscopic approach to the treatment of gastrointestinal bleeding. Techniques in vascular and interventional radiology Lim, J. K., Ahmed, A. 2004; 7 (3): 123-129


    Gastrointestinal endoscopy is the primary diagnostic and therapeutic modality in the management of gastrointestinal bleeding. Esophagogastroduodenoscopy, small bowel enteroscopy, and colonoscopy are well-established standards for initial evaluation of gastrointestinal bleeding, and have been used effectively for diagnosis, prognosis, and therapy. Although thermal, injection, and mechanical methods have been the mainstay of endoscopic therapy, promising new technologies such as endoscopic ultrasound and wireless capsule endoscopy will further advance our ability to improve morbidity and mortality from severe gastrointestinal hemorrhage. Herein we review current standards and recent advances in the endoscopic management of upper, lower, and obscure gastrointestinal bleeding.

    View details for PubMedID 16015556

  • Older age and liver transplantation: A review LIVER TRANSPLANTATION Keswani, R. N., Ahmed, A., Keeffe, E. B. 2004; 10 (8): 957-967


    Patients older than 60 are undergoing transplantation with increasing frequency. Reports from several transplant centers document that overall short-term patient survival rates in seniors undergoing liver transplantation are comparable to survival rates of younger adults. However, specific subgroups of older patients may not fare as well. Seniors with far-advanced end-stage liver disease are high-risk for liver transplantation and have poor survival rates. In addition, seniors older than 65 have worse outcomes than those who are 60 to 65, and studies have shown increased mortality with increasing age as a continuous variable. On the other hand, the majority of seniors who survive liver transplantation have full or only minimally limited functional status. Preoperative evaluation of older patients for transplantation requires careful screening to exclude cardiopulmonary disease, malignancy, and other diseases of the aged. Paradoxically, seniors may benefit from a senescent immune system, which results in decreased requirements for immunosuppressive drugs, and possibly a lower rate of acute allograft rejection. Despite good overall short-term survival in the elderly, long-term survival may be worse because of an increased rate of long-term complications, such as malignancy and heart disease. In conclusion, although advanced age is a negative risk factor, advanced age alone should not exclude a patient from liver transplantation; however, it mandates thorough pretransplant evaluation and careful long-term follow-up with attention to usual health maintenance issues in the elderly.

    View details for DOI 10.1002/lt.20155

    View details for Web of Science ID 000223274300002

    View details for PubMedID 15390320

  • Chronic hepatitis C with normal aminotransferase levels GASTROENTEROLOGY Ahmed, A., Keeffe, E. B. 2004; 126 (5): 1409-1415

    View details for DOI 10.1053/j.gastro.2004.02.073

    View details for Web of Science ID 000221217100022

    View details for PubMedID 15131801

  • Hypoglycemic coma in a pregnant woman in association with hepatitis B virus carrier state and hepatocellular carcinoma JOURNAL OF CLINICAL GASTROENTEROLOGY Ahmed, A., Keeffe, E. B. 2004; 38 (2): 135-136

    View details for Web of Science ID 000188547200012

    View details for PubMedID 14745290

  • Living donor liver transplantation in a patient with hepatic epithelioid hemangioendothelioma JOURNAL OF CLINICAL GASTROENTEROLOGY Simpson, N. D., Ahmed, A. M., Simpson, P. W., Parkar, J. A., Keeffe, E. B., Ahmed, A. 2003; 37 (4): 349-350

    View details for Web of Science ID 000185458400017

    View details for PubMedID 14506396

  • Prophylaxis against chemotherapy-induced reactivation of hepatitis B virus infection with lamivudine JOURNAL OF CLINICAL GASTROENTEROLOGY Simpson, N. D., Simpson, P. W., Ahmed, A. M., Nguyen, M. H., Garcia, G., Keeffe, E. B., Ahmed, A. 2003; 37 (1): 68-71


    The results of lamivudine therapy in 4 patients with chemotherapy-induced hepatitis B virus (HBV) reactivation are reported. Cancer chemotherapy-induced reactivation is a known complication in patients with chronic HBV infection or history of HBV infection with recovery. Reactivation of HBV infection has a broad spectrum of manifestations ranging from mild elevation of aminotransferase levels to fatal fulminant hepatitis. Lamivudine is a nucleoside analogue and a potent inhibitor of HBV reverse transcription. The 4 patients treated with lamivudine included 1 woman with breast cancer and 3 men with non-Hodgkin lymphoma, ranging from 41 to 63 years of age. All 4 patients were undergoing standard, multi-agent chemotherapy when they presented with HBV reactivation manifested by sudden onset of fatigue, jaundice, and HBV serology consistent with active HBV infection (detectable serum HBV DNA) in the absence of other known causes of acute hepatitis. Lamivudine therapy (100 mg/d in 3 patients and 150 mg/d in 1 patient) was initiated from 1 to 18 days following the diagnosis of HBV reactivation. All 4 patients showed rapid decrease in aminotransferase levels within 2 weeks after initiating lamivudine therapy. Unfortunately, hepatic synthetic function failed to improve in 2 patients, who both died. The remaining 2 patients had suppression of HBV DNA to undetectable levels after 1 and 4 months of treatment and had biochemical and clinical improvement. The 2 patients who died received lamivudine therapy for 8 days and for 3 weeks. There have been no randomized clinical trials to study the role of lamivudine for prophylaxis or treatment of HBV reactivation associated with chemotherapy. However, based on our limited experience, lamivudine may be efficacious in suppressing potentially fatal HBV reactivation secondary to chemotherapy in patients with chronic HBV infection or prior infection with recovery. Patients who undergo chemotherapy should be screened for the presence of markers of chronic hepatitis B infection or previous HBV infection. We recommend that patients with chronic HBV infection (positive HBV DNA and/or positive HBsAg) or history of HBV infection with recovery (positive hepatitis B core antibody with or without HBsAb) be considered for prophylactic lamivudine use to prevent chemotherapy-induced HBV reactivation.

    View details for Web of Science ID 000183597500016

    View details for PubMedID 12811213

  • Update on chronic hepatitis C. Comprehensive therapy Ahmed, A., Keeffe, E. B. 2003; 29 (4): 224-232


    Strategies for the diagnosis and treatment of chronic hepatitis C continue to evolve. Liver biopsy is now used selectively rather than routinely, and the combination peginterferon plus ribavirin is the treatment of choice for the majority of patients.

    View details for PubMedID 14989044

  • The epidemiology of hepatitis C virus infection JOURNAL OF CLINICAL GASTROENTEROLOGY Yen, T., Keeffe, E. B., Ahmed, A. 2003; 36 (1): 47-53


    The prevalence of hepatitis C virus (HCV) infection varies in different populations, ranging from as low as 0.6% in volunteer blood donors to as high as 80% in injection drug users. The prevalence of HCV in a population can be predicted by risk factors associated with the transmission of infection. These risk factors include injection drug use, blood product transfusion, organ transplantation, hemodialysis, occupational injury, sexual transmission, and vertical transmission. We review the literature regarding the incidence and prevalence of HCV infection and the evidence supporting various modes of HCV transmission.

    View details for Web of Science ID 000180031600015

    View details for PubMedID 12488709

  • Hepatitis C virus and liver transplantation. Clinics in liver disease Ahmed, A., Keeffe, E. B. 2001; 5 (4): 1073-1090


    Advances in immunosuppressive therapy, operative techniques, and perioperative management have resulted in long-term patient survival rates approaching 90% following liver transplantation for chronic viral hepatitis. The increasing number of referrals for liver transplantation reflects the impact of chronic HCV infection as a cause of end-stage liver disease. Unlike hepatitis B, there is still no effective treatment in preventing recurrent hepatitis C after liver transplantation. The spectrum of allograft injury related to universal HCV infection recurrence ranges from no evidence of histologic injury to mild inflammation to severe disease with allograft failure in small proportion of patients. Various factors may explain these differing outcomes, including degree of pretransplantation viremia, HLA compatibility, presence of more pathogenic HCV genotypes, integrity of cellular immune response, and type of immunosuppression. Fortunately, patient survival does not seem to be affected short-term; the long-term outcome of liver transplantation for chronic hepatitis C is unclear but is likely to be decreased. Combination therapy with interferon plus ribavirin seems to be a promising treatment strategy for posttransplantation recurrent hepatitis C, and the use of pegylated interferon plus ribavirin may improve these results. Patients with moderate to severe allograft hepatitis are appropriate candidates for combination antiviral therapy. Histopathologically documented recurrent hepatitis C in liver transplant recipients is associated with impaired quality of life, inferior physical condition, and a higher incidence of depression compared with patients who did not have HCV and in those without HCV recurrence. In conclusion, it is possible that the continued improvements in antiviral therapy against HCV infection may ultimately decrease the number of patients needing liver transplantation. Suitable candidates with chronic HCV infection thus warrant treatment with pegylated interferon plus ribavirin combination therapy in the hope of decreasing disease progression. Recent studies, which require confirmation, suggest that nonresponders to standard antiviral therapy may benefit from maintenance therapy. The donor pool for patients with chronic hepatitis C and decompensated cirrhosis can be improved by using HCV-positive donors and by increasing utilization of newer surgical techniques, including adult-to-adult living-donor liver transplantation and split-liver transplantation.

    View details for PubMedID 11685796

  • Liver transplantation: Evolving patient selection criteria CANADIAN JOURNAL OF GASTROENTEROLOGY Yu, A. S., Ahmed, A., Keeffe, E. B. 2001; 15 (11): 729-738


    The widespread recognition of the success of liver transplantation as a treatment for most types of acute and chronic liver failure has led to increased referrals for transplantation in the setting of a relatively fixed supply of cadaver donor organs. These events have led to a marked lengthening of the waiting time for liver transplantation, resulting in increased deaths of those on the waiting list and sicker patients undergoing transplantation. Nearly 5000 liver transplantations were performed in the United States in 2000, while the waiting list grew to over 17,000 patients. The mounting disparity between the number of liver transplant candidates and the limited supply of donor organs has led to reassessment of the selection and listing criteria for liver transplantation, as well as revision of organ allocation and distribution policies for cadaver livers. The development of minimal listing criteria for patients with chronic liver disease based on a specific definition for decompensation of cirrhosis has facilitated the more uniform listing of patients at individual centres across the United States. The United Network for Organ Sharing, under pressure from transplant professionals, patient advocacy groups and the federal government, has continuously revised allocation and distribution policies based on the ethical principles of justice for the individual patient versus optimal utility of the limited organ supply available annually. Beginning in 2002, it is likely that the Model for End-stage Liver Disease (MELD) score will be implemented to determine disease severity and direct donor organs to the sickest patients rather than to those with the longest waiting times.

    View details for Web of Science ID 000172393600003

    View details for PubMedID 11727003

  • Delayed fatal hemorrhage from pseudoaneurysm of the hepatic artery after percutaneous liver biopsy AMERICAN JOURNAL OF GASTROENTEROLOGY Ahmed, A., Samuels, S. L., Keeffe, E. B., Cheung, R. C. 2001; 96 (1): 233-237


    Hemorrhage is the most common serious complication of percutaneous liver biopsy. Liver biopsy is usually done in an outpatient setting because most significant hemorrhage is evident within a few hours after biopsy. Delayed hemorrhage occurs much less frequently but carries a much higher mortality. We present a 41-yr-old man with chronic hepatitis C who underwent a percutaneous liver biopsy uneventfully but was found to have a pseudoaneurysm of the hepatic artery 5 days later. Shortly after admission, the patient experienced bleeding into the liver from the pseudoaneurysm, which was controlled initially by angiographic embolization. However, recurrent bleeding could not be controlled by repeat angiography and surgical intervention, and the patient expired. The diagnosis and management of pseudoaneurysm of the hepatic artery complicating liver biopsy is reviewed.

    View details for Web of Science ID 000166435400039

    View details for PubMedID 11197259

  • A novel endoscopic appearance of idiopathic eosinophilic esophagitis ENDOSCOPY Ahmed, A., Matsui, S., Soetikno, R. 2000; 32 (6): S33-S33

    View details for Web of Science ID 000087298000021

    View details for PubMedID 10863926

  • The differential diagnosis of eosinophilic esophagitis JOURNAL OF CLINICAL GASTROENTEROLOGY Ahmad, M., Soetikno, R. M., Ahmed, A. 2000; 30 (3): 242-244


    Eosinophilic esophagitis is a morphologic finding that may result from a wide spectrum of clinical conditions. The distinctive histological features accompanying eosinophilic esophagitis may facilitate the diagnosis of the underlying disease entity. Unfortunately, there are no pathognomonic histologic characteristics associated with eosinophilic esophagitis. Clinical signs and symptoms, immunological markers, endoscopic findings, and response to therapy may help establish or confirm the diagnosis of a clinical condition that results in eosinophilic esophagitis. The following discussion outlines the causes of eosinophilia in an esophageal biopsy sample.

    View details for Web of Science ID 000086336500006

    View details for PubMedID 10777180

  • Management of gallstones and their complications AMERICAN FAMILY PHYSICIAN Ahmed, A., Cheung, R. C., Keeffe, E. B. 2000; 61 (6): 1673-1680


    The accurate differentiation of gallstone-induced biliary colic from other abdominal disease processes is the most crucial step in the successful management of gallstone disease. Despite the availability of many imaging techniques to demonstrate the presence of gallstones, clinical judgment ultimately determines the association of symptoms with cholelithiasis and its complications. Adult patients with silent or incidental gallstones should be observed and managed expectantly, with few exceptions. In symptomatic patients, the intervention varies with the type of gallstone-induced complication. In this article, we review the salient clinical features, diagnostic tests and therapeutic options employed in the management of gallstones and their complications.

    View details for Web of Science ID 000086196400009

    View details for PubMedID 10750875

  • Differential diagnosis of gallstone-induced complications SOUTHERN MEDICAL JOURNAL Ahmad, M., Cheung, R. C., Keeffe, E. B., Ahmed, A. 2000; 93 (3): 261-264


    Early recognition and prompt intervention are the most crucial steps in the management of gallstone-induced biliary disease. Many conditions can mimic the presentation of gallstone-induced complications. Therefore, participation of a clinically astute physician is essential in evaluating symptoms and interpreting diagnostic data in patients with symptomatic gallstones.

    View details for Web of Science ID 000085880200002

    View details for PubMedID 10728510

  • Cost-effective evaluation of acute viral hepatitis WESTERN JOURNAL OF MEDICINE Ahmed, A., Keeffe, E. B. 2000; 172 (1): 29-32

    View details for Web of Science ID 000084858500020

    View details for PubMedID 10695442

  • Novel endoscopic approach for removal of a rectal foreign body GASTROINTESTINAL ENDOSCOPY Ahmed, A., Cummings, S. A. 1999; 50 (6): 872-874

    View details for Web of Science ID 000083941700034

    View details for PubMedID 10570362

  • Overview of interferon therapy for chronic hepatitis C. Clinics in liver disease Ahmed, A., Keeffe, E. B. 1999; 3 (4): 757-773


    The future therapy for chronic hepatitis C will probably include measures to decrease hepatocellular injury along with multidrug combinations, including inhibitors of the hepatitis C viral protease, helicase, or polymerase to reduce serum levels or eradicate HCV RNA. The results of recently concluded trials of IFN-alpha 2b plus ribavirin combination therapy have shown a twofold improvement in the biochemical and virologic response rates and superiority by other measures of efficacy with an acceptable safety profile. In view of these results, new guidelines for the management of chronic HCV infection are appropriate (Fig. 1).

    View details for PubMedID 11291249

  • The successful use of telemedicine in acute variceal hemorrhage JOURNAL OF CLINICAL GASTROENTEROLOGY Ahmed, A., Slosberg, E., Prasad, P., Keeffe, E. B., Imperial, J. C. 1999; 29 (2): 212-213

    View details for Web of Science ID 000082193800027

    View details for PubMedID 10478893

  • A novel technique for endoscopic removal of expandable biliary Wallstent GASTROINTESTINAL ENDOSCOPY Ahmed, A., Keeffe, E. B., Imperial, J. C. 1999; 50 (2): 279-281

    View details for Web of Science ID 000081929400027

    View details for PubMedID 10425430

  • Should we throw fat on the fire? Comment INFLAMMATORY BOWEL DISEASES Ahmed, A., Triadafilopoulos, G. 1999; 5 (3): 236-237
  • Tuberculous peritonitis: Fatality associated with delayed diagnosis SOUTHERN MEDICAL JOURNAL Ahmad, M., Ahmed, A. 1999; 92 (4): 406-408


    We describe a fatal case of tuberculous peritonitis and review the literature on the diagnostic modalities available to diagnose this entity. We suspect a delayed diagnosis resulted in the death of our patient. Today, the prompt diagnosis of an unknown ascitic process involves laparoscopy. A patient with unknown large volume ascites is the easiest and safest to laparoscope. Using a mini laparoscope, a bedside procedure with instantaneous return can be done. The newer noninvasive tests like determination of ascites fluid adenosine deaminase activity and polymerase chain reaction may be helpful in the prompt diagnosis of peritoneal tuberculosis. We recommend that patients with clinical presentation suggestive of peritoneal tuberculosis have either an aggressive diagnostic workup using high-yield tests or a trial of antituberculous therapy.

    View details for Web of Science ID 000079711100010

    View details for PubMedID 10219360

  • An uncommon aetiology of perforated gastric ulcer POSTGRADUATE MEDICAL JOURNAL Ahmad, M., Vaidyan, P., Ahmed, A. 1999; 75 (880): 113-114

    View details for Web of Science ID 000078440000017

    View details for PubMedID 10448478

  • Lamivudine therapy for chemotherapy-induced reactivation of hepatitis B virus infection AMERICAN JOURNAL OF GASTROENTEROLOGY Ahmed, A., Keeffe, E. B. 1999; 94 (1): 249-251


    A 54-yr-old man with lymphoma and serological evidence of prior hepatitis B virus (HBV) infection, with detectable anti-HBc and anti-HBs, was treated with intensive chemotherapy. He had reactivation of HBV infection with acute hepatitis B manifest by detectable HBsAg and elevated aminotransferase levels >1000 IU/L. He was treated with lamivudine 150 mg daily and had prompt resolution of acute hepatitis B with return of elevated aminotransferases to normal, and initial loss of HBeAg with later loss of HBsAg. Lamivudine was continued during the course of further chemotherapy as prophylaxis against repeat HBV reactivation. Lamivudine is a nucleoside analogue that is a potent inhibitor of HBV reverse transcriptase and HBV replication. Lamivudine therapy should be considered for the treatment of HBV reactivation and might play a future role as preemptive therapy of HBV reactivation in patients with prior hepatitis B or chronic hepatitis B with inactive viral replication.

    View details for Web of Science ID 000082426600048

    View details for PubMedID 9934765

  • Asymptomatic elevation of aminotransferase levels and fatty liver secondary to heterozygous hypobetalipoproteinemia AMERICAN JOURNAL OF GASTROENTEROLOGY Ahmed, A., Keeffe, E. B. 1998; 93 (12): 2598-2599

    View details for Web of Science ID 000077465200055

    View details for PubMedID 9860439

  • Bloody diarrhea caused by Plesiomonas shigelloides proctitis in a human immunodeficiency virus-infected patient CLINICAL INFECTIOUS DISEASES Ahmad, M., Aggarwal, M., Ahmed, A. 1998; 27 (3): 657-657

    View details for Web of Science ID 000075917900047

    View details for PubMedID 9770179

  • Esophageal perforation from Maloney dilator following esophageal biopsy. Medicine and health, Rhode Island Aggarwal, M., Vaidyan, P. B., Ahmed, A. 1998; 81 (4): 144-145

    View details for PubMedID 9597835

  • A fatal case of Rhodotorula meningitis in AIDS. Medicine and health, Rhode Island Ahmed, A., Aggarwal, M., Chiu, R., Ramratnam, B., Rinaldi, M., Flanigan, T. P. 1998; 81 (1): 22-23

    View details for PubMedID 9473937

  • Splenic rupture: An unusual complication of colonoscopy AMERICAN JOURNAL OF GASTROENTEROLOGY Ahmed, A., Eller, P. M., Schiffman, F. J. 1997; 92 (7): 1201-1204


    Splenic rupture is an uncommon complication of colonoscopy. A high index of suspicion is a crucial factor in the prompt diagnosis of this rare but potentially fatal complication. We report a case of splenic rupture diagnosed 3 days after a colonoscopy and requiring splenectomy. We also reviewed 17 reported cases of splenic rupture after colonoscopy, including our case. The presumed mechanisms of splenic rupture during colonoscopy are direct trauma to the spleen, excessive splenocolic ligament traction, and decrease in the relative mobility between the spleen and the colon. Of the 17 cases reviewed, 10 had polypectomy and/or biopsy performed during colonoscopy. Other probable risk factors are identified and tabulated. The hemodynamic status of the patient is the primary factor used to determine the therapeutic option. Computed tomographic (CT) scan of the abdomen reliably demonstrates well-contained splenic laceration and subcapsular hematoma, and differentiates these splenic complications from perisplenic clot and hemoperitoneum. Thus, CT scan may help decide which patients may be managed operatively or nonoperatively. Splenectomy is the operative procedure of choice for splenic rupture after colonoscopy. Conservative management includes broad spectrum antibiotics, intravenous fluids, blood transfusion, and close hemodynamic monitoring. The factors mandating further evaluation of persistent abdominal pain after colonoscopy are hemodynamic instability, clinical features of acute abdomen, leukocytosis, and/or acute anemia. The onset of abdominal pain associated with one or more of these critical factors is usually within 24 h after colonoscopy. An emergent CT scan of the abdomen is the modality of choice to further evaluate these clinical features, but intestinal perforation and external bleeding must first be excluded.

    View details for Web of Science ID A1997XK10700029

    View details for PubMedID 9219800

Conference Proceedings

  • Treatment strategies for chronic hepatitis C: Update since the 1997 National Institutes of Health Consensus Development Conference Ahmed, A., Keeffe, E. B. WILEY-BLACKWELL PUBLISHING, INC. 1999: S12-S18


    The National Institutes of Health Consensus Development Conference on the management of hepatitis C, which took place in March 1997 and was published in September 1997, established guidelines for the diagnosis and management of chronic hepatitis C. The recommended treatment of chronic hepatitis C virus (HCV) infection is interferon alpha (or equivalent) 3 MIU three times per week for 12 months, in patients showing response to therapy after 3 months. Patients with the greatest risk for progression to cirrhosis (i.e. persistently elevated alanine aminotransferase levels, detectable serum HCV-RNA and liver biopsy showing portal or bridging fibrosis and at least moderate inflammation and necrosis) are recommended as candidates for therapy. The indication for therapy is less obvious in patients with milder histological changes, compensated cirrhosis and age less than 18 years or older than 60 years. Treatment is not indicated for patients with persistently normal aminotransferases or decompensated cirrhosis. This review outlines the background studies that led to the recommendations of the National Institutes of Health for the treatment of chronic hepatitis C and reviews newer evolving treatment strategies over the past year. In particular, the results of studies exploring treatment options for relapsers and non-responders to prior interferon therapy and the reported results to date on the safety and efficacy of combination therapy with interferon plus ribavirin are highlighted. Although aggressive suppression of HCV-RNA with induction therapy (daily and/or higher doses) or long-acting pegylated interferon preparations may improve the current results of therapy, few data are yet available. Finally, the treatment of chronic hepatitis C with protease inhibitors holds promise but has yet to reach the stage of clinical trials.

    View details for Web of Science ID 000081033600004

    View details for PubMedID 10382632

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