title: Nonalcoholic steatohepatitis in nondiabetic obese patients.
abstract: BACKGROUND
  Nonalcoholic steatohepatitis (NASH) is a major disorder in patients with persistent changes in aminotransferase activity who test negative for viral markers and autoantibodies. Although NASH has been correlated with obesity, no study has been carried out exclusively with nondiabetic obese patients.
  
  
  OBJECTIVE
  To evaluate the occurrence of NASH in obese patients without diabetes mellitus and to assess the severity of histological involvement of the liver.
  
  
  METHODS
  Serum aminotransferase levels were evaluated in 912 obese patients seen at an outpatient clinic in Porto Alegre, Brazil, from 1997 to 1999. Sixty-eight patients were found to have altered aminotransferase levels in more than one test. Thirty-five patients were excluded due to the presence of diabetes mellitus (n=12), the presence of viral markers (n=11), alcohol consumption (n=8) and the use of hepatotoxic drugs (n=4). NASH was diagnosed when histological findings revealed macrovesicular steatosis associated with lobular inflammatory infiltrate and hepatocellular injury.
  
  
  RESULTS
  Of the 912 obese patients studied, 33 patients with altered aminotransferase levels underwent liver biopsy. Four patients were excluded because they had steatosis only; the remaining 29 patients (3.18%) fulfilled the diagnostic criteria established for NASH. The mean age of the 29 patients was 42.2 +/- 11.9 years; 65.52% of the patients were women. Grading of histological findings revealed mild disease in 58.6% of cases; important proliferation of fibrous tissue was absent in most cases.
  
  
  CONCLUSIONS
  NASH is a common disease among nondiabetic obese patients with altered aminotransferase levels, and it usually manifests as a mild clinical condition, although more severe lesions may be observed.
authors.affiliation: Department of Gastroenterology, Santa Casa University Hospital, Porto Alegre, Brazil. izamin@terra.com.br
authors.forename: Idilio
authors.initials: I
authors.lastname: Zamin
authors.forename: Angelo Alves
authors.initials: AA
authors.lastname: de Mattos
authors.forename: Cláudio Galeano
authors.initials: CG
authors.lastname: Zettler
mesh_terms: D000328:Adult; D000410:Alanine Transaminase / Q000097:blood; D001219:Aspartate Aminotransferases / Q000097:blood; D015415:Biomarkers / Q000097:blood; D001706:Biopsy; D015992:Body Mass Index; D001938:Brazil; D002784:Cholesterol / Q000097:blood; D048909:Diabetes Complications; D005234:Fatty Liver / Q000097:blood / Q000150:complications*; D005260:Female; D006505:Hepatitis / Q000097:blood / Q000150:complications*; D006801:Humans; D008099:Liver / Q000098:blood supply / Q000473:pathology; D008297:Male; D008875:Middle Aged; D009765:Obesity / Q000097:blood / Q000150:complications*; D011446:Prospective Studies; D012720:Severity of Illness Index; D013223:Statistics as Topic; D014280:Triglycerides / Q000097:blood
chemical_list: D015415:Biomarkers; D014280:Triglycerides; D002784:Cholesterol; D001219:Aspartate Aminotransferases; D000410:Alanine Transaminase