Management of Ascending Colon Diverticulosis with Hematochezia

Initial Assessment and Stabilization

For patients with diverticulosis of the ascending colon presenting with hematochezia, urgent colonoscopy within 24 hours is the recommended first-line management approach for both diagnosis and potential therapeutic intervention 1, 2
Perform immediate hemodynamic assessment including vital signs, hemoglobin, hematocrit, and coagulation parameters to evaluate bleeding severity 2
For patients with severe bleeding, maintain hemoglobin level >7 g/dL and mean arterial pressure >65 mmHg while avoiding fluid overload 3
Provide intravenous fluid replacement and blood transfusions as necessary based on hemodynamic status 3
Correct any coagulopathy before invasive procedures 1

Perform urgent colonoscopy within 24 hours of presentation for patients with evidence of ongoing bleeding or high-risk features 3
Ensure thorough bowel preparation to improve visualization, as poor preparation may lead to incomplete evaluation 1
Consider upper endoscopy to exclude an upper GI source of bleeding, especially in patients with hemodynamic instability (up to 15% of patients with serious hematochezia have an upper GI source) 4, 2
For hemodynamically unstable patients or those with suspected active bleeding, CT angiography (CTA) may be performed first to rapidly localize the bleeding site 2

Approximately 75% of episodes of acute lower GIB due to diverticulosis stop spontaneously, especially in patients requiring transfusions of <4 units of blood over a 24-hour period 5

Consider repeat colonoscopy if the initial examination is inconclusive but suggests bleeding around the ileocecal valve 1
If repeat colonoscopy fails to identify the source, consider radionuclide imaging with [99Tcm] pertechnetate-labeled red blood cells, which can detect active bleeding at rates of 0.1-0.5 mL/min 1
Angiography should be performed only after positive scintigraphy or in patients with hemodynamic instability and severe unremitting bleeding 1