title: [Role of early colonoscopy in severe acute lower gastrointestinal bleeding].
abstract: BACKGROUND
  Severe acute lower gastrointestinal bleeding (SALGIB) accounts for 15% of cases of acute lower gastrointestinal bleeding (ALGIB). The incidence increases with age and comorbidity. Identification of the origin of bleeding may be difficult. Colonoscopy has been proposed as the primary investigative tool.
  
  
  OBJECTIVE
  To assess the role of early colonoscopy as the primary method of evaluation in patients with SALGIB.
  
  
  METHODS
  Retrospective study based on a guideline for clinical practice approved in our institution. The study included 50 patients with SALGIB admitted to our gastrointestinal bleeding unit between January 1998 and April 2000. SALGIB was suspected when patients fulfilled two or more of the following criteria: 1) significant hemodynamic compromise, 2) decrease in hemoglobin 2 g/dl, and 3) transfusion requirement >= 2 blood units. Early colonoscopy was performed within 24 hours of onset of bleeding. An accurate endoscopic diagnosis was established if a lesion with active bleeding, visible non-hemorrhagic vessel or adherent red clot was identified. A presumptive diagnosis was made when hematochezia or fresh blood localized in a colonic segment, associated with a single, potentially hemorrhagic lesion, was observed and when the results of esophagogastroduodenoscopy were negative. Colonoscopy, esophagogastroduodenoscopy, barium studies, nuclear scan and angiography were performed.
  
  
  RESULTS
  Two hundred twenty-two patients were admitted for ALGIB. Fifty patients(22%) fulfilled the SALGIB criteria. The male/female ratio was 1:1. Definitive diagnosis was accurate in 20 patients. The most frequent cause was angiodysplasia (6 patients) and rectal ulcer (6 patients). Eighteen patients had a presumptive diagnosis; of these 14 had diverticulosis. In 12 patients, no cause was identified. Colonoscopy was performed in 45 patients, of which 32 were performed early and 13 electively. Accurate endoscopic diagnosis was more frequently established with early colonoscopy than with elective colonoscopy (15 [47%] vs 2 [15%], p < 0.05). The results of urgent nuclear scans contributed to accurate diagnosis in 5 out of the 10 patients in whom this technique was performed. Angiography was performed in 2 patients. Endoscopic therapy was attempted in 4 patients, all during early colonoscopy. Ten patients (20%) underwent surgery and 3 patients (6%) died.
  
  
  CONCLUSIONS
  In 22% of patients with ALGIB admitted to our hospital bleeding was severe. Colonoscopy is the diagnostic tool of choice. When performed within 24 hours of hospital admission, this technique provides more accurate diagnosis than when performed electively.
authors.affiliation: Unidad Clínica de Aparato Digestivo, Hospital Universitario Reina Sofía, Córdoba, Spain.
authors.forename: M
authors.initials: M
authors.lastname: García Sánchez
authors.forename: A
authors.initials: A
authors.lastname: González Galilea
authors.forename: P
authors.initials: P
authors.lastname: López Vallejos
authors.forename: C
authors.initials: C
authors.lastname: Gálvez Calderón
authors.forename: A
authors.initials: A
authors.lastname: Naranjo Rodríguez
authors.forename: J
authors.initials: J
authors.lastname: de Dios Vega
authors.forename: G
authors.initials: G
authors.lastname: Miño Fugarolas
mesh_terms: D000208:Acute Disease; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D003108:Colonic Diseases / Q000175:diagnosis*; D003113:Colonoscopy; D005260:Female; D006471:Gastrointestinal Hemorrhage / Q000175:diagnosis*; D006801:Humans; D008297:Male; D008875:Middle Aged; D012189:Retrospective Studies; D012720:Severity of Illness Index