title: A randomized trial measuring fecal blood loss after treatment with rofecoxib, ibuprofen, or placebo in healthy subjects.
abstract: OBJECTIVE
  Gastrointestinal microbleeding, as assessed by the measurement of (51)chromium-labeled red blood cells, is a marker of the mucosal injury associated with the use of nonsteroidal anti-inflammatory drugs. This study tested the hypotheses that cyclooxygenase-2 specific inhibition with rofecoxib would cause less fecal blood loss than a therapeutic dose of ibuprofen and would be equivalent to placebo.
  
  
  METHODS
  In this randomized, double-blind group study, gastrointestinal blood loss was assessed by measurement of fecal (51)chromium radioactivity during a 1-week placebo baseline period and during 4 weeks of treatment with rofecoxib (25 mg or 50 mg once daily), ibuprofen (800 mg three times daily), or placebo in 67 healthy subjects. Gastrointestinal blood loss during treatment weeks 2 to 4 (versus the baseline period) was expressed as the geometric mean ratio of fecal radioactivity in weeks 2 to 4 compared with baseline.
  
  
  RESULTS
  Ibuprofen caused significantly (P <0.001) greater gastrointestinal blood loss (geometric mean ratio of 5.2, 95% confidence interval [CI]: 4.2 to 6.3) than the 25-mg dose of rofecoxib (2.6, 95% CI: 2.2 to 3.1), the 50-mg dose of rofecoxib (2.6, 95% CI: 2.2 to 3.0), or placebo (2.1, 95% CI: 1.8 to 2.5). In contrast, gastrointestinal blood loss with both doses of rofecoxib were equivalent to placebo by a predetermined clinical similarity bound.
  
  
  CONCLUSIONS
  In healthy subjects, treatment with rofecoxib, at 2 to 4 times the doses that are currently recommended for the treatment of patients with osteoarthritis, produced significantly less fecal blood loss than a therapeutic dose of ibuprofen and was equivalent to placebo.
authors.affiliation: McMaster University, Hamilton, Ontario, Canada.
authors.forename: R H
authors.initials: RH
authors.lastname: Hunt
authors.forename: B
authors.initials: B
authors.lastname: Bowen
authors.forename: E R
authors.initials: ER
authors.lastname: Mortensen
authors.forename: T J
authors.initials: TJ
authors.lastname: Simon
authors.forename: C
authors.initials: C
authors.lastname: James
authors.forename: A
authors.initials: A
authors.lastname: Cagliola
authors.forename: H
authors.initials: H
authors.lastname: Quan
authors.forename: J A
authors.initials: JA
authors.lastname: Bolognese
mesh_terms: D000328:Adult; D000894:Anti-Inflammatory Agents, Non-Steroidal / Q000008:administration & dosage / Q000009:adverse effects*; D002860:Chromium Radioisotopes; D051546:Cyclooxygenase 2; D052246:Cyclooxygenase 2 Inhibitors; D016861:Cyclooxygenase Inhibitors / Q000008:administration & dosage / Q000009:adverse effects*; D004311:Double-Blind Method; D004334:Drug Administration Schedule; D004912:Erythrocytes / Q000000981:diagnostic imaging; D006471:Gastrointestinal Hemorrhage / Q000139:chemically induced* / Q000000981:diagnostic imaging; D006801:Humans; D007052:Ibuprofen / Q000008:administration & dosage / Q000009:adverse effects*; D007527:Isoenzymes / Q000037:antagonists & inhibitors; D007783:Lactones / Q000008:administration & dosage / Q000009:adverse effects*; D008297:Male; D008565:Membrane Proteins; D008875:Middle Aged; D009780:Occult Blood; D010003:Osteoarthritis / Q000188:drug therapy; D011451:Prostaglandin-Endoperoxide Synthases; D011877:Radionuclide Imaging; D019275:Radiopharmaceuticals; D012016:Reference Values; D013450:Sulfones; D016896:Treatment Outcome
chemical_list: D000894:Anti-Inflammatory Agents, Non-Steroidal; D002860:Chromium Radioisotopes; D052246:Cyclooxygenase 2 Inhibitors; D016861:Cyclooxygenase Inhibitors; D007527:Isoenzymes; D007783:Lactones; D008565:Membrane Proteins; D019275:Radiopharmaceuticals; D013450:Sulfones; C116926:rofecoxib; D051546:Cyclooxygenase 2; C496540:PTGS2 protein, human; D011451:Prostaglandin-Endoperoxide Synthases; D007052:Ibuprofen