On the Bleeding Edge: Mastering GI Emergencies and Inpatient GI Consultation (Live and Virtual)| September 2026-Guideline management-of-patients-with-acute-lower-gastrointestinal

Guideline management-of-patients-with-acute-lower-gastrointestinal

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The updated ACG guideline on acute lower gastrointestinal bleeding (LGIB) provides evidence-based recommendations for assessing, diagnosing, and treating patients with hematochezia from a colorectal source. Key updates emphasize risk stratification, the growing role of CT angiography (CTA), selective use of anticoagulant reversal, and nonurgent inpatient colonoscopy.<br /><br />The guideline suggests using risk scores such as the Oakland score to identify low-risk patients who may be safely discharged early for outpatient evaluation, but these tools should complement, not replace, clinical judgment. For hemodynamically stable patients, a restrictive red blood cell transfusion strategy is recommended, with transfusion generally at hemoglobin <7 g/dL.<br /><br />For patients on anticoagulants, reversal is usually unnecessary unless bleeding is life-threatening. In warfarin-treated patients with markedly elevated INR, 4-factor prothrombin complex concentrate is preferred over fresh frozen plasma. For direct oral anticoagulants, targeted reversal agents may be used in severe, refractory cases if the drug was taken within the prior 24 hours. Tranexamic acid is not recommended.<br /><br />Colonoscopy remains the main diagnostic test for most hospitalized patients, but urgent colonoscopy within 24 hours does not improve major outcomes; therefore, a nonemergent inpatient colonoscopy is preferred. CTA is recommended as the initial test for ongoing hemodynamically significant hematochezia, and positive CTA findings should prompt interventional radiology for angiography and possible embolization.<br /><br />Endoscopic therapy should be used when active bleeding or stigmata of recent hemorrhage are found. For diverticular bleeding, clips, endoscopic band ligation, or coagulation are recommended.<br /><br />After bleeding stops, nonaspirin NSAIDs should be discontinued, aspirin decisions should depend on cardiovascular indication, and anticoagulation should generally be resumed because restarting reduces thromboembolism and mortality despite some rebleeding risk.

Keywords

acute lower gastrointestinal bleeding

hematochezia

ACG guideline

risk stratification

Oakland score

CT angiography

colonoscopy

anticoagulant reversal

diverticular bleeding

endoscopic therapy