Betania Negre

University of Miami Miller School of Medicine, Miami, Florida, United States

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Publications (5)24.66 Total impact

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    ABSTRACT: Adiponectin is a regulator of cytokines that, in turn, play a vital role in inflammatory and immune responses. Adiponectin is therefore likely to have a contributory role in hepatitis C virus (HCV) infection. We sought to characterize adiponectin levels and examine correlates in a pediatric HCV infected cohort.
    Journal of pediatric gastroenterology and nutrition. 10/2014;
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    ABSTRACT: To evaluate the rate of pediatric hepatitis C virus (HCV) case ascertainment relative to the estimated number of actual cases. Data from Florida and United States health departments were used to assess pediatric HCV case ascertainment rates in Florida and nationwide. The percentage of children infected with HCV from Miami-Dade County receiving medical care by a pediatric gastroenterologist was estimated based on data obtained from physician questionnaires. From 2000 through 2009, 2007 children were identified as having positive HCV antibody tests in Florida, only 12% of the expected number (n = 12 155). An estimated 1.6% of the expected children with HCV who tested Ab-positive (37 of 1935) were actively followed by a pediatric gastroenterologist in Miami-Dade County, Florida. Across the United States, only 4.9% of the expected cases have been identified. The identification of children infected with HCV in the nation as a whole is grossly inadequate. Only a small fraction of cases are identified. In Florida, less than 2% of children identified receive treatment. Lack of identification and lack of treatment of children infected with HCV constitute critical public health problems. Strategies to increase awareness of HCV infection and to screen at-risk individuals could substantially improve morbidity and mortality while reducing health care costs.
    The Journal of pediatrics 07/2012; 161(5):915-21. · 4.02 Impact Factor
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    ABSTRACT: Evidence demonstrates that obesity is associated with progression of chronic hepatitis C virus (HCV) infection and poor response to interferon therapy among HCV-infected adults. However, this evidence has been confounded by multiple comorbidities present in adult cohorts and the use of single adult doses. We performed a retrospective investigation to evaluate the role of body mass index (BMI) in chronic HCV progression and response to therapy in the children. One hundred twenty-three children and teenagers studied at Children's Hospital Boston for HCV infection between 1998 and 2007 were included. Patients' weight and height at the time of liver biopsy or before and after HCV therapy were obtained and BMI was calculated. The presence of steatosis was statistically associated with higher mean (+/-SE) BMI percentiles (72nd +/- 5.8 vs 58th +/- 3.5) percentile; F(1,101) = 4.2, P = 0.04. Nonresponders to treatment had a higher mean (+/-SE) BMI percentile (70th +/- 7.4) when compared with responders (50th +/- 6.5) in univariate and multivariate analyses (P = 0.04, P = 0.02, respectively). Using a multivariate model, it was calculated that 1 standard deviation (1 z-score unit) increase in baseline BMI z score is associated with a 12% decrease in the probability of sustained virologic response. Overweight adversely affects the progression of chronic HCV liver disease and is associated with diminished response to antiviral therapy using weight-based dosing in a cohort with minimal comorbidities.
    Journal of pediatric gastroenterology and nutrition 08/2010; 51(2):191-7. · 2.18 Impact Factor
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    ABSTRACT: Hepatitis C virus (HCV) infection is associated with an increased prevalence of diabetes and insulin resistance (IR); whether this is a causal relationship has not been established. We performed a longitudinal study within the lead-in phase of the Hepatitis C Antiviral Long-Term Treatment against Cirrhosis (HALT-C) Trial to evaluate whether suppression of hepatitis C is associated with improvement in IR. Participants had advanced hepatic fibrosis and carried non-3 HCV genotypes (n = 96). Patients underwent 24 weeks of pegylated interferon and ribavirin therapy and were categorized into HCV clearance groups at week 20 on the basis of HCV RNA levels; null responders had <1 log(10) decline (n = 38), partial responders had >or=1 log(10) decline (n = 37) but detectable HCV RNA, and complete responders had no detectable HCV RNA (n = 21). The primary outcome was change (week 20 minus week 0) in IR by using the homeostasis model assessment (HOMA2-IR). Adjusting only for baseline HOMA2-IR, mean HOMA2-IR differences were -2.23 (complete responders), -0.90 (partial responders), and +0.18 (null responders) (P = .036). The observed differences in mean HOMA2-IR scores were ordered in a linear fashion across response groups (P = .01). The association between HCV clearance and improvement in HOMA2-IR could not be accounted for by adiponectin or tumor necrosis factor-alpha and was independent of potential confounders including age, gender, ethnicity, body mass index, duration of infection, medications used, and fibrosis. HCV suppression correlates with improvement in IR. These data provide further support for a role of HCV in the development of insulin resistance.
    Clinical gastroenterology and hepatology: the official clinical practice journal of the American Gastroenterological Association 02/2010; 8(5):458-62. · 5.64 Impact Factor
  • Gastroenterology 01/2010; 138(5). · 12.82 Impact Factor