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Difficulty: HardGastroenterology and Hepatology

Emergency medical services transport a 64-year-old male to the trauma bay following multiple episodes of massive, bright red rectal bleeding at his residence. He is somnolent and profoundly diaphoretic. Initial vital signs reveal a temperature of 36.8°C (98.2°F), heart rate of 134/min, respiratory rate of 24/min, and blood pressure of 76/42 mm Hg. Collateral history from his partner indicates he takes daily high-dose naproxen for lumbar osteoarthritis. The abdomen is soft and non-tender without organomegaly. Digital rectal examination demonstrates a vault full of fresh blood and clots. Two large-bore peripheral intravenous catheters have just been inserted. Arrange the following subsequent management steps in the most appropriate chronological order for evaluating and treating this hemodynamically unstable patient.

  1. 1Initiate rapid volume resuscitation with intravenous crystalloids and packed red blood cells
  2. 2Perform urgent esophagogastroduodenoscopy (EGD)
  3. 3Obtain computed tomography (CT) angiography of the abdomen and pelvis
  4. 4Perform catheter-directed angiography with embolization
  5. 5Proceed to surgical bowel resection

Answer

The correct sequential order is: 1) Initiate rapid volume resuscitation, 2) Perform urgent esophagogastroduodenoscopy (EGD), 3) Obtain computed tomography (CT) angiography, 4) Perform catheter-directed angiography with embolization, 5) Proceed to surgical bowel resection.
The management algorithm for hemodynamically unstable patients presenting with massive hematochezia begins with immediate volume resuscitation, addressing the patient's hemorrhagic shock. Once intravenous access is established and fluids/blood are running, the next critical step is an EGD. This is because a brisk upper GI bleed can present as bright red blood per rectum and is a highly lethal, yet easily treatable, etiology. If the EGD is negative, the source is confirmed as lower GI. In an unstable patient with active bleeding, CT angiography is the diagnostic modality of choice to rapidly localize the active bleeding vessel without requiring bowel preparation. This is directly followed by therapeutic catheter-directed angiography to embolize the vessel. Surgical bowel resection is reserved strictly as a salvage option if embolization fails or is not feasible.

Step-by-Step Solution

1
Address profound hemodynamic instability
Initiate rapid volume resuscitation
Airway, Breathing, and Circulation (ABC) protocols mandate immediate intravascular volume repletion in the setting of class III or IV hemorrhagic shock prior to diagnostic imaging or scopes.
2
Rule out a massive upper gastrointestinal hemorrhage
Perform urgent esophagogastroduodenoscopy (EGD)
Brisk upper gastrointestinal bleeding (e.g., peptic ulcer disease from NSAID use) can mimic lower GI bleeding by presenting as massive hematochezia due to rapid transit time. It must be rapidly excluded or treated.
3
Localize the active lower gastrointestinal bleeding source
Obtain CT angiography of the abdomen and pelvis
With an upper GI source ruled out, CT angiography is the most rapid and accurate test to pinpoint the site of active extravasation in an unstable patient. Colonoscopy is contraindicated as it is unsafe and poorly visualized without bowel preparation.
4
Attempt minimally invasive hemostasis
Perform catheter-directed angiography with embolization
Angiography allows for the targeted occlusion of the specific bleeding vessel that was identified non-invasively on the CT angiography.
5
Perform definitive salvage therapy if previous steps fail
Proceed to surgical bowel resection
Surgery is the highly morbid treatment of last resort if less invasive angiographic techniques fail to achieve or maintain hemostasis.

Key Concept

In hemodynamically unstable patients presenting with massive hematochezia, an upper gastrointestinal bleeding source must be excluded with an EGD immediately after resuscitation, prior to pursuing lower GI investigations.
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Topics

Gastroenterology and Hepatology

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