Massive rectal bleeding caused by diversion colitis

A 74-year-old male patient presented to the emergency department with hematochezia and dizziness. Seven years ago, the patient had a colonoscopy at another hospital, during which a perforation in the sigmoid colon was found; consequently, he underwent a loop colostomy. He was pale, with a blood pressure of 70/40 mmHg and a pulse of 130 beats per minute