Management of Hematochezia

Initial Assessment and Resuscitation

• The American College of Surgeons recommends performing immediate hemodynamic assessment including vital signs, blood count, and coagulation parameters to evaluate bleeding severity in patients with hematochezia 1, 2
• The World Journal of Emergency Surgery suggests establishing two large-bore venous access for fluid resuscitation and blood product administration in patients with severe bleeding 2
• For patients with severe bleeding, the World Journal of Emergency Surgery recommends maintaining hemoglobin level >7 g/dL and mean arterial pressure >65 mmHg while avoiding fluid overload 3, 2
• The World Journal of Emergency Surgery advises providing intravenous fluid replacement and blood transfusions as necessary based on hemodynamic status 3, 1
• Correct any coagulopathy before invasive procedures, as recommended by the World Journal of Emergency Surgery 3, 1
• Insert urinary catheter to monitor hourly urine output (target >30 mL/hr) in severe cases, as suggested by Praxis Medical Insights 2
• Consider discontinuing antiplatelet agents temporarily during acute bleeding episodes, as recommended by Praxis Medical Insights 2

Diagnostic Approach

• The World Journal of Emergency Surgery recommends urgent colonoscopy within 24 hours as the first-line diagnostic approach after hemodynamic stabilization 3, 1
• Ensure thorough bowel preparation to improve visualization, as poor preparation may lead to incomplete evaluation, according to Praxis Medical Insights 1, 4
• Consider upper endoscopy to exclude an upper GI source of bleeding, especially in patients with hemodynamic instability, as 10-15% of patients with severe hematochezia have an upper GI source 5, 6, 2
• For hemodynamically unstable patients or those with suspected active bleeding, CT angiography may be performed first to rapidly localize the bleeding site, as suggested by Praxis Medical Insights 2

Diagnostic Algorithm When Initial Colonoscopy is Inconclusive

• If initial colonoscopy is inconclusive but suggests bleeding around the ileocecal valve, perform repeat colonoscopy with thorough bowel preparation, as recommended by Praxis Medical Insights 4
• 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, according to Praxis Medical Insights 1, 4
• Angiography should be performed only after positive scintigraphy or in patients with hemodynamic instability and severe unremitting bleeding, as suggested by Praxis Medical Insights 4
• Angiography requires a bleeding rate of at least 1 mL/min for accurate detection of extravasation, according to Praxis Medical Insights 4

Therapeutic Interventions

• Endoscopic hemostasis is the preferred first-line treatment for accessible bleeding sources identified during colonoscopy, as recommended by the World Journal of Emergency Surgery 3
• Multiple endoscopic techniques are available for controlling bleeding, including injection therapy, thermal coagulation, and mechanical methods such as clips, according to the World Journal of Emergency Surgery 3
• For anorectal varices with mild bleeding, focus on optimal medication for portal hypertension along with supportive care, as suggested by the World Journal of Emergency Surgery 3
• For radiation proctitis causing bleeding, consider formalin application or sucralfate enemas, as recommended by Alimentary Pharmacology and Therapeutics 6

Common Causes of Hematochezia

• Diverticular bleeding is the most common cause of lower GI bleeding in adults, according to Praxis Medical Insights 1
• Angiodysplasia is the most common in cecum and proximal ascending colon, as reported by Alimentary Pharmacology and Therapeutics 5, 4
• Inflammatory bowel disease and other forms of colitis can cause hematochezia, according to Alimentary Pharmacology and Therapeutics 6
• Anorectal varices in patients with portal hypertension can cause hematochezia, as suggested by the World Journal of Emergency Surgery 3

Special Considerations

• Approximately 75% of episodes of acute lower GI bleeding due to diverticulosis stop spontaneously, according to Praxis Medical Insights 1
• In patients with severe hematochezia and hypovolemia, consider an upper GI source even when presentation suggests lower GI bleeding, as recommended by Alimentary Pharmacology and Therapeutics 5, 6
• Nasogastric lavage before upper endoscopy is warranted if there is medium to low suspicion of an upper GI source, according to Alimentary Pharmacology and Therapeutics 5, 6
• For patients with radiation proctitis causing recurrent bleeding, endoscopic treatment with argon plasma coagulation or application of formalin may be effective, as suggested by Alimentary Pharmacology and Therapeutics 6

Common Pitfalls to Avoid

• Delaying resuscitation to perform diagnostic procedures; stabilization takes priority, as recommended by Praxis Medical Insights 2
• Inadequate bowel preparation leading to poor visualization during colonoscopy, according to Praxis Medical Insights 4
• Over-transfusion, which may increase portal pressure and potentially worsen bleeding in patients with portal hypertension, as suggested by the World Journal of Emergency Surgery and Praxis Medical Insights 3, 2
• Premature resort to surgery without attempting to localize bleeding through radiological and/or endoscopic modalities first, according to Praxis Medical Insights 2

Evaluation of Hematochezia

Initial Assessment and Management

• The World Journal of Emergency Surgery recommends performing blood typing and cross-matching for patients showing signs of severe bleeding, and including serum electrolytes, BUN, and creatinine in initial laboratory assessment, in patients with severe hematochezia 7, 8
• Consider pregnancy testing in women of childbearing age with hematochezia, as part of the initial assessment 7, 8

Critical History and Physical Examination

• Obtain a focused medical history emphasizing timing of bleeding, associated symptoms, medication use, and history of liver disease or portal hypertension, in patients with hematochezia 7, 8
• Perform a digital rectal examination to assess for anorectal pathology and confirm presence of blood, in patients with hematochezia 7, 8
• Assess for comorbidities and use risk stratification scores incorporating vital signs, laboratory values, and medication history, in patients with hematochezia 7

Special Diagnostic Considerations

• Perform endoscopic ultrasound with color Doppler as a second-line tool for deep rectal varices, as EUS detects varices in 85% versus 45% with endoscopy alone, in patients with anorectal varices 8
• Consider contrast-enhanced CT if EUS is unavailable or fails to detect bleeding, in patients with anorectal varices 8
• Use MRI angiography in pregnant patients if ultrasound fails and clinical scenario permits, in patients with anorectal varices 8
• Imaging (CT, MRI, or endoanal ultrasound) should only be performed if suspicion exists for concomitant anorectal disease, in patients with hemorrhoidal bleeding 7
• Medical history and physical examination are key factors driving diagnostic workup, as imaging has a limited role in uncomplicated hemorrhoidal bleeding, in patients with hemorrhoidal bleeding 7

Evaluation and Management of Acute Hematochezia with Potential Upper‑GI Source

Initial Resuscitation and Hemodynamic Stabilization

• Place two large‑bore intravenous catheters and begin aggressive fluid resuscitation while obtaining vital signs, complete blood count, coagulation profile, and blood typing with cross‑match. (Evidence from Alimentary Pharmacology and Therapeutics) 9
• Correct coagulopathy before endoscopic evaluation: give fresh‑frozen plasma if INR > 1.5 and platelet transfusion if platelet count < 50 × 10⁹/L. (Evidence from Alimentary Pharmacology and Therapeutics) 9

Diagnostic Algorithm

Upper Endoscopy (EGD) as First‑Line Test

• 10–15 % of patients who present with hematochezia have an upper‑GI bleeding source despite the bright‑red appearance of the blood. (American College of Radiology) 10
• Urgent EGD within 24 hours is recommended for patients with hematochezia accompanied by recent heartburn, because upper‑GI pathology (peptic ulcer, erosive esophagitis, Dieulafoy lesion) may be responsible. (American College of Radiology) 10
• When an upper‑GI source is present, EGD identifies the bleeding site in ≈ 95 % of cases, enabling immediate therapeutic intervention and providing prognostic information. (American College of Radiology) 10

Colonoscopy After a Negative Upper Endoscopy

• If EGD is negative, colonoscopy should be performed within 24 hours after hemodynamic stabilization; it is the definitive diagnostic test for lower‑GI bleeding and also allows therapeutic measures. (Alimentary Pharmacology and Therapeutics) 9

Upper‑GI Sources to Consider

• Peptic ulcer disease can cause brisk bleeding that manifests as hematochezia. (American College of Radiology) 10
• Erosive esophagitis related to gastro‑oesophageal reflux disease should be suspected in patients with several weeks of heartburn preceding hematochezia. (American College of Radiology) 10
• Dieulafoy lesions account for 1–2 % of acute upper‑GI bleeds and may produce massive hemorrhage presenting as hematochezia. (American College of Radiology) 10

Lower‑GI Evaluation (Post‑EGD)

• Colonoscopy with biopsy remains the gold‑standard diagnostic modality for lower‑GI bleeding after a negative upper endoscopy, and it can also deliver endoscopic therapy when needed. (Alimentary Pharmacology and Therapeutics) 9