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Difficulty: HardGastroenterology and Hepatology

An 81-year-old gentleman arrives at the emergency department accompanied by his daughter after experiencing three episodes of massive, painless, bright red blood per rectum over the past 4 hours. His medical history is significant for coronary artery disease, atrial fibrillation, and hypertension. Current medications include apixaban, metoprolol, and lisinopril. On arrival, he is lethargic and pale. Temperature is 36.8°C (98.2°F), blood pressure is 82/50 mm Hg, and pulse is 124/min. Physical examination reveals a distended abdomen with hyperactive bowel sounds but no focal tenderness or guarding. Digital rectal examination shows gross bright red blood. Arrange the following critical steps in the management of this patient's acute presentation in the most appropriate chronological sequence.

  1. 1Establish bilateral large-bore peripheral intravenous access and administer isotonic crystalloids
  2. 2Perform an esophagogastroduodenoscopy (EGD)
  3. 3Obtain a computed tomography (CT) angiography of the abdomen and pelvis
  4. 4Perform catheter-directed mesenteric angiography with potential embolization

Answer

The correct chronological sequence is to first initiate hemodynamic resuscitation with intravenous fluids, followed by an esophagogastroduodenoscopy to rule out a brisk upper gastrointestinal source. After an upper source is excluded, a CT angiography is performed to localize the lower gastrointestinal bleeding, which is then definitively managed with therapeutic catheter-directed mesenteric angiography.
The algorithm for massive hematochezia with hemodynamic instability dictates that resuscitation is the universal first step. Because a massive upper gastrointestinal bleed (e.g., from a peptic ulcer or varices) transits the gut rapidly and presents as bright red blood per rectum in 10-15% of cases, an EGD must be performed next. Only after ruling out an upper source should the lower tract be investigated. In an unstable patient with ongoing bleeding, colonoscopy is contraindicated due to lack of bowel prep; therefore, a CT angiography is the diagnostic test of choice to localize the bleeding, followed by therapeutic catheter-directed embolization.

Step-by-Step Solution

1
Establish intravenous access and administer isotonic crystalloids.
Restores intravascular volume and addresses hypovolemic shock.
Hemodynamic stabilization is always the immediate first step in massive hemorrhage prior to any diagnostic testing.
2
Perform an esophagogastroduodenoscopy (EGD).
Excludes a massive upper gastrointestinal hemorrhage.
Brisk upper GI bleeding can present as bright red blood per rectum and is rapidly fatal; it is the most critical source to rule out immediately in an unstable patient.
3
Obtain a CT angiography of the abdomen and pelvis.
Localizes the specific bleeding vessel in the lower gastrointestinal tract.
In hemodynamically unstable patients with ongoing bleeding, there is no time for bowel preparation required for colonoscopy. CTA can detect bleeding rates as low as 0.3 mL/min without preparation.
4
Perform catheter-directed mesenteric angiography.
Embolization of the localized bleeding source.
Provides definitive therapeutic control of the hemorrhage once the bleeding vessel has been identified by the preceding CTA.

Key Concept

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

Gastroenterology and Hepatology

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