title: Warfarin-associated bleeding complication saved life.
abstract: A 62-year-old Caucasian man with atrial fibrillation who was taking warfarin reported an episode of hematochezia; his international normalized ratio (INR) was 1.74. His weekly warfarin dose was increased by approximately 5%, and he was given three fecal occult blood cards. At follow-up 1 week later, the patient denied any episodes of hematochezia. His INR was 1.69 despite the increased warfarin dosage. One of the occult blood cards showed a positive result, and colonoscopy revealed a 5-cm lesion, identified as Dukes' A adenocarcinoma. Warfarin-associated bleeding generally is considered deleterious; however, in our patient it unmasked an early stage of colon cancer and thus may have saved the patient's life. Although minor gastrointestinal bleeding is common among patients taking anticoagulants, all patients should be fully evaluated because the source of hemorrhage may be malignant.
authors.affiliation: School of Pharmacy, Texas Tech University Health Sciences Center, Amarillo 79106, USA. kenneth@cortex.ama.ttuhsc.edu
authors.forename: Kenneth L
authors.initials: KL
authors.lastname: McCall
authors.forename: Eric J
authors.initials: EJ
authors.lastname: MacLaughlin
mesh_terms: D001281:Atrial Fibrillation / Q000150:complications / Q000188:drug therapy; D003110:Colonic Neoplasms / Q000150:complications / Q000175:diagnosis*; D006470:Hemorrhage / Q000139:chemically induced* / Q000150:complications; D006801:Humans; D008297:Male; D008875:Middle Aged; D009780:Occult Blood; D014859:Warfarin / Q000009:adverse effects* / Q000627:therapeutic use
chemical_list: D014859:Warfarin