title: Role of acute viral hepatitis as a confounding factor in antituberculosis treatment induced hepatotoxicity.
abstract: OBJECTIVE
  Drug induced hepatotoxicity (DIH) is an important and commonly encountered adverse effect with antituberculosis (anti-TB) treatment. Acute viral hepatitis (AVH) is an important confounding reason which clinically, biochemically and histologically mimics DIH.
  
  
  METHODS
  The contributory role of acute viral hepatitis as a confounding factor in patients with normal baseline liver functions who developed acute hepatitis while receiving short-course anti-TB treatment was prospectively studied. The sera of all patients who developed acute hepatitis were analysed for markers for hepatitis A, B, C and E viruses.
  
  
  RESULTS
  Viral hepatitis was present in 15 of the 102 (14.7%) patients who developed acute hepatitis while receiving anti-TB treatment with hepatitis E virus being the most common cause Later onset of acute hepatitis [58 (5-133) vs. 26 (3-221) days; P=0.04], large elevations in aspartate aminotransferase (AST) [371 (30-2643) vs. 212 (63-1990 IU/l); P=0.03] and alanine aminotransferase (ALT) [388 (31-2997) vs. 225 (52- 1670 IU/l); P= 0.002] and a longer time for normalization of deranged liver functions [36.7 +/- 13.3 vs. 24.5 +/- 19.3 days; P=0.02] indicated acute viral hepatitis as the cause of liver function derangement.
  
  
  CONCLUSIONS
  Our findings showed AVH in 14.7 per cent patients who developed hepatotoxicity while an anti-TB treatment. Therefore, in endemic areas, viral hepatitis should be sought after and excluded in all patients suspected to have DIH before attributing the hepatotoxic effect to the anti-TB drugs.
authors.affiliation: Division of Pulmonary, Critical Care & Sleep Medicine, Department of Medicine, All India Institute of Medical Sciences, New Delhi, India.
authors.forename: Pawan
authors.initials: P
authors.lastname: Sarda
authors.forename: S K
authors.initials: SK
authors.lastname: Sharma
authors.forename: Alladi
authors.initials: A
authors.lastname: Mohan
authors.forename: Govind
authors.initials: G
authors.lastname: Makharia
authors.forename: Arvind
authors.initials: A
authors.lastname: Jayaswal
authors.forename: R M
authors.initials: RM
authors.lastname: Pandey
authors.forename: Sarman
authors.initials: S
authors.lastname: Singh
mesh_terms: D000328:Adult; D000410:Alanine Transaminase / Q000097:blood; D000995:Antitubercular Agents / Q000009:adverse effects* / Q000627:therapeutic use; D001219:Aspartate Aminotransferases / Q000097:blood; D056486:Chemical and Drug Induced Liver Injury / Q000209:etiology*; D005260:Female; D006525:Hepatitis, Viral, Human / Q000503:physiopathology*; D006801:Humans; D007194:India; D008297:Male; D008875:Middle Aged; D018709:Statistics, Nonparametric; D014376:Tuberculosis / Q000188:drug therapy*
chemical_list: D000995:Antitubercular Agents; D001219:Aspartate Aminotransferases; D000410:Alanine Transaminase