title: Acute pancreatitis and the role of histamine-2 receptor antagonists: a meta-analysis of randomized controlled trials of cimetidine.
abstract: OBJECTIVE
  Acute pancreatitis is a common disorder. Histamine type-2 receptor antagonists (H2RAs) are frequently used in patients with acute pancreatitis to reduce pancreatic juice secretion. However, most of the studies on this topic have involved only a few patients, demonstrating no beneficial effect but without harm. To clarify this matter, a meta-analysis was conducted to assess the efficacy of H2RAs.
  
  
  METHODS
  All randomized controlled trials written in English comparing the effects of H2RAs with those of placebo were retrieved. Clinical outcome data were extracted and the results pooled to yield odds ratios or weighted mean differences. Two investigators reviewed articles independently and reached a consensus.
  
  
  RESULTS
  A total of 285 patients from five studies were included. Cimetidine was the only H2RA used to treat acute pancreatitis. The pooled odds ratio of complications for H2RAs versus placebo was 1.64 (95% confidence interval [CI] 0.92 to 2.92). A weighted mean difference of duration of pain was 6.96 h (95% CI -2.50 to 16.43 h) in favour of placebo.
  
  
  CONCLUSIONS
  Cimetidine is not more effective than placebo in reducing acute pancreatitis-related complications and the duration of pain; rather, the use of cimetidine for acute pancreatitis could be associated with higher rates of complications and pain. Until the results of a large randomized trial show otherwise, H2RAs should not be used in the absence of specific clinical indications.
authors.affiliation: Department of General Medicine and Clinical Epidemiology, Kyoto University Graduate School of Medicine, Japan.
authors.forename: Takeshi
authors.initials: T
authors.lastname: Morimoto
authors.forename: Yoshinori
authors.initials: Y
authors.lastname: Noguchi
authors.forename: Tatsuya
authors.initials: T
authors.lastname: Sakai
authors.forename: Takuro
authors.initials: T
authors.lastname: Shimbo
authors.forename: Tsuguya
authors.initials: T
authors.lastname: Fukui
mesh_terms: D000208:Acute Disease; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D002927:Cimetidine / Q000627:therapeutic use*; D005260:Female; D006635:Histamine H2 Antagonists / Q000627:therapeutic use*; D006801:Humans; D008297:Male; D008875:Middle Aged; D010195:Pancreatitis / Q000188:drug therapy*; D016032:Randomized Controlled Trials as Topic
chemical_list: D006635:Histamine H2 Antagonists; D002927:Cimetidine