Participants - Consecutive patients admitted with overt signs of acute upper GIB (melena, hematemesis, drop in hemoglobin with or without hypotension) and documented bleeding (Forrest I) from a non-variceal upper gastrointestinal sourcegastro-duodenal ulcers, Mallory Weiss tear, cancers, Dieulafoy's and other vascular lesions) at endoscopy.