Lower gastrointestinal bleeding. Diagnostic approach and management conclusions.

The management of patients with lower gastrointestinal bleeding requires a systematic approach based on defined diagnostic and therapeutic methods. Although in 80 percent of patients bleeding will stop spontaneously, 25 percent will have rebleeding and 50 percent of those with rebleeding will bleed again. Angiography documents specific bleeding sites but raises questions related to the incidence, site and frequency of bleeding, as well as the necessity of demonstrating extravasation. We reviewed 49 arteriograms performed for lower gastrointestinal bleeding. We conclude from our findings that angiography identifies a presumptive cause of bleeding in 49 percent of patients; angiography identified the site of bleeding in 86 percent of the patients with active bleeding, thus allowing segmental colectomy. We believe that documentation of angiodysplasia in a patient with lower gastrointestinal bleeding is presumptive evidence for the site of bleeding. Angiography is useful and worthwhile in the work-up of patients with lower gastrointestinal bleeding in an attempt to plan localized, definitive resection, and this may lead to a lower mortality rate.