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Difficulty: MediumGastrointestinal and Abdominal Surgery

A 74-year-old woman is brought to the emergency department due to the sudden onset of severe, unremitting abdominal pain that began 2 hours ago. She has a medical history of hypertension, hyperlipidemia, and atrial fibrillation, but has not been taking her prescribed anticoagulant medication. On physical examination, she appears distressed and diaphoretic. Her temperature is 37.1°C, blood pressure is 118/74 mmHg, and heart rate is 112/min and irregularly irregular. Abdominal examination reveals a soft, non-distended abdomen with mild diffuse tenderness but no guarding or rebound tenderness. Bowel sounds are hypoactive. Laboratory studies show a leukocyte count of 18,500/mm³ and a serum lactate of 3.8 mmol/L. Arrange the following management steps in the most appropriate sequential order for this patient.

  1. 1Initiation of aggressive intravenous fluid resuscitation and broad-spectrum antibiotics.
  2. 2Computed tomography angiography of the abdomen and pelvis.
  3. 3Exploratory laparotomy with superior mesenteric artery embolectomy.
  4. 4Resection of frankly necrotic intestinal segments.
  5. 5Second-look laparotomy 24 to 48 hours after the initial operation.

Answer

The correct sequence is: Fluid resuscitation and antibiotics, followed by CT angiography, then laparotomy with embolectomy, followed by resection of necrotic bowel, and finally a planned second-look laparotomy.
The correct management of acute mesenteric ischemia follows a strict protocol to minimize mortality and bowel loss. It begins with resuscitation (fluids/antibiotics) to stabilize the patient, followed by CTA for rapid diagnosis. In the operating room, the absolute rule is to restore perfusion (embolectomy) before assessing tissue viability, ensuring that only irreversibly necrotic bowel is resected. Finally, because borderline tissue may declare itself later, a second-look laparotomy is standard practice.

Step-by-Step Solution

1
Identify the patient's clinical presentation as highly suspicious for acute acute mesenteric ischemia.
The combination of severe pain out of proportion to the physical exam, atrial fibrillation (embolic source), leukocytosis, and elevated lactate points directly to mesenteric ischemia.
Recognizing the life-threatening emergency dictates an immediate, protocol-driven response.
2
Prioritize initial medical stabilization.
Place IV lines, administer crystalloid fluids, and give broad-spectrum antibiotics.
Patients with ischemic bowel rapidly sequester fluids and are at high risk for bacterial translocation and sepsis.
3
Select the appropriate diagnostic imaging.
Order a CT angiography of the abdomen and pelvis.
CTA is highly sensitive and specific for detecting arterial occlusions in the superior mesenteric artery and helps plan the surgical approach.
4
Determine the correct intraoperative sequence.
Perform the embolectomy before resecting any bowel.
Restoring perfusion first allows marginally ischemic bowel to recover, preventing the unnecessary resection of viable tissue and reducing the risk of short bowel syndrome.
5
Plan for postoperative reassessment.
Schedule a second-look laparotomy within 24 to 48 hours.
It is often impossible to definitively determine bowel viability during the initial operation; a second look ensures no necrotic bowel is missed while maximizing bowel preservation.

Key Concept

Management sequence for acute mesenteric ischemia, emphasizing revascularization prior to resection.
Estimated Time:1m 30s
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Topics

Gastrointestinal and Abdominal Surgery

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