Bleeding colonic diverticula.

Area of Science:

• Gastroenterology
• Colorectal Surgery
• Vascular Medicine

Background:

• Diverticula of the large intestine are a frequent cause of lower gastrointestinal (GI) bleeding.
• This bleeding, ranging from occult to massive, often originates from the right colon, despite most diverticula being in the left colon.
• Rupture of the vasa recta, eccentrically located toward the diverticular lumen, is the primary cause.

Purpose of the Study:

• To summarize the etiology, presentation, and management of lower GI bleeding secondary to colonic diverticulosis.
• To highlight the prevalence and common sources of diverticular hemorrhage.
• To discuss associated risk factors and treatment considerations.

Main Methods:

• Review of existing literature on diverticular disease and lower GI bleeding.
• Analysis of the pathophysiology of bleeding from diverticula.
• Synthesis of information on diagnostic and therapeutic approaches.

Main Results:

• Lower GI bleeding occurs in 10-30% of GI bleeds, predominantly in the elderly, with diverticular disease being a major contributor.
• Right-sided colonic hemorrhage is common, despite the majority of diverticula residing in the left colon.
• Spontaneous cessation of bleeding occurs in approximately 90% of cases; inflammation is usually absent.

Conclusions:

• Diverticula are a significant cause of lower GI bleeding, particularly in older adults.
• While often self-limiting, factors like hypertension, anticoagulation, diabetes, and ischemic heart disease may be associated.
• Conservative management is preferred due to high recurrence rates with invasive interventions like angiography and surgery.