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Difficulty: Very hardSurgical and Procedural Interventions

A 74-year-old woman is evaluated in the emergency department for sudden, severe, diffuse abdominal pain that began 4 hours ago. She has a history of paroxysmal atrial fibrillation, type 2 diabetes mellitus, and chronic kidney disease. She recently stopped taking her apixaban due to financial constraints. On presentation, her temperature is 38.2°C (100.8°F), blood pressure is 82/50 mm Hg, pulse is 128/min and irregularly irregular, and respirations are 24/min. Physical examination reveals a rigid, distended abdomen with diffuse rebound tenderness and involuntary guarding. Laboratory studies show a leukocyte count of 22,000/mm³ and serum lactate of 8.4 mmol/L (Normal: 0.5-2.2 mmol/L). Aggressive intravenous fluid resuscitation and broad-spectrum antibiotics are initiated.

Which of the following procedural and surgical interventions are definitively indicated in the management of this patient? (Select all that apply)

  1. Emergent open exploratory laparotomyAnswer
  2. Surgical embolectomy of the superior mesenteric arteryAnswer
  3. C
    Immediate computed tomography angiography of the abdomen
  4. D
    Percutaneous endovascular catheter-directed thrombolysis
  5. E
    Resection of necrotic bowel with immediate primary anastomosis

Answer

The correct interventions are emergent open exploratory laparotomy AND surgical embolectomy of the superior mesenteric artery.
The correct interventions focus on immediate life-saving surgery. The patient's history of unanticoagulated atrial fibrillation combined with sudden-onset abdominal pain strongly suggests acute embolic superior mesenteric artery (SMA) occlusion. The subsequent development of peritonitis (rigidity, rebound guarding), shock (hypotension, tachycardia), and severe lactic acidosis indicates transmural bowel infarction. In the setting of peritonitis and hemodynamic instability, emergent open exploratory laparotomy is the absolute mandatory next step to resect dead tissue. Concurrently, surgical embolectomy of the SMA must be performed to restore perfusion to the remaining viable bowel. Delaying for imaging or attempting medical/endovascular salvage in the presence of peritonitis is inappropriate.

Step-by-Step Solution

1
Analyze the patient's presentation and history.
The patient has sudden, severe abdominal pain, atrial fibrillation off anticoagulation, hypotension, and a high lactate.
This constellation of findings is classic for acute embolic mesenteric ischemia.
2
Evaluate the physical examination findings.
The patient has a rigid, distended abdomen with rebound tenderness and guarding.
These findings indicate peritonitis, which signifies transmural bowel infarction and impending or actual perforation.
3
Determine the appropriate sequence of interventions.
The patient requires an immediate emergent exploratory laparotomy.
Hemodynamic instability combined with peritonitis is an absolute indication for emergent surgical exploration. Imaging (e.g., CT angiography) must be bypassed to avoid fatal delays.
4
Identify the necessary intraoperative procedures.
Surgical embolectomy of the superior mesenteric artery is required.
To salvage any ischemic but viable bowel, blood flow must be restored by removing the embolus before or during the resection of frankly necrotic segments.

Key Concept

In patients with acute mesenteric ischemia, the development of peritonitis or hemodynamic instability mandates emergent exploratory laparotomy and restoration of mesenteric blood flow (e.g., surgical embolectomy). Preoperative advanced imaging and primary bowel anastomosis are strictly contraindicated in this setting.
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Surgical and Procedural Interventions

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