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Difficulty: MediumGastrointestinal and Abdominal Surgery

A 74-year-old man is brought to the emergency department after passing a large volume of bright red blood per rectum at home. Upon arrival, he is confused and diaphoretic. His blood pressure is 82/50 mm Hg, and his heart rate is 125/min. His abdomen is soft, non-tender, and non-distended. Digital rectal examination reveals copious gross bright red blood. He has a history of hypertension, hyperlipidemia, and osteoarthritis. Arrange the following interventions in the most appropriate sequence for the management of this patient's acute life-threatening hemorrhage.

  1. 1Initiate aggressive fluid resuscitation and blood transfusion via large-bore intravenous access.
  2. 2Perform an esophagogastroduodenoscopy (EGD) to rule out an upper gastrointestinal source.
  3. 3Obtain a computed tomography (CT) angiography of the abdomen and pelvis.
  4. 4Perform catheter-directed mesenteric angiography with targeted embolization.
  5. 5Proceed to an emergent exploratory laparotomy with segmental or subtotal colectomy.

Answer

The correct management sequence is: Resuscitation first, followed by EGD to rule out an upper GI source, then CT Angiography to localize the lower bleed, followed by Catheter Angiography with Embolization for treatment, and finally Surgery as a last resort.
The algorithm for massive, unstable hematochezia dictates that resuscitation is the universal first step. Once volume replacement is initiated, an EGD must be performed to quickly rule out a life-threatening upper GI bleed, which accounts for 10-15% of cases presenting with severe hematochezia. If EGD is negative, non-invasive localization with CT angiography is the next best step, as it can detect rapid bleeding without requiring bowel preparation. Following localization, catheter-directed angiography allows for targeted embolization. Emergent colectomy carries high morbidity and mortality and is reserved strictly for refractory cases where embolization fails.

Step-by-Step Solution

1
Initiate aggressive fluid resuscitation and blood transfusion via large-bore intravenous access.
Restores intravascular volume and improves hemodynamics.
The patient is in hemorrhagic shock (hypotension, tachycardia, confusion); immediate stabilization is required before any diagnostic studies.
2
Perform an esophagogastroduodenoscopy (EGD) to rule out an upper gastrointestinal source.
Excludes peptic ulcer disease or variceal hemorrhage as the source of massive hematochezia.
Brisk upper GI bleeding can transit the bowel rapidly and present as bright red blood per rectum, especially in patients with hemodynamic instability.
3
Obtain a computed tomography (CT) angiography of the abdomen and pelvis.
Localizes the precise site of lower gastrointestinal hemorrhage.
Unprepared colonoscopy is technically difficult and often non-diagnostic in massive, active bleeding. CTA is fast and detects bleeding rates as low as 0.3 mL/min.
4
Perform catheter-directed mesenteric angiography with targeted embolization.
Achieves hemostasis without the need for major abdominal surgery.
Once localized by CTA, selective embolization provides definitive control with lower morbidity than surgery.
5
Proceed to an emergent exploratory laparotomy with segmental or subtotal colectomy.
Surgically removes the bleeding source.
Surgical intervention is the definitive treatment of last resort if minimally invasive techniques fail or the patient deteriorates rapidly despite maximal resuscitation.

Key Concept

Algorithm for the management of massive, hemodynamically unstable lower gastrointestinal bleeding.
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Topics

Gastrointestinal and Abdominal Surgery

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