Abstract
We report a 66-year-old woman who was diagnosed with paroxysmal atrial fibrillation one year ago and had been on dabigatran treatment. She was admitted to our hospital with hematochezia, and colonoscopy revealed a submucosal hematoma in the sigmoid colon. We assumed that it was the source of bleeding, so dabigatran treatment was stopped, and she was treated conservatively with bowel rest and intravenous fluid hydration. Following initiation of the therapy, she had no symptoms of hematochezia ; she recovered with conservative therapy. Then, she started taking pilsicainide because of atrial fibrillation, and the hematoma healed without rebleeding. To our knowledge, colorectal submucosal hematoma in anticoagulant dabigatran therapy is unusual, and we are the first to report a case like this in Japan.
