Examkin

Question

Difficulty: MediumGastrointestinal and Abdominal Surgery

A 78-year-old woman is brought to the emergency department due to the sudden onset of excruciating abdominal pain that began 2 hours ago. She has a history of congestive heart failure and atrial fibrillation, for which she has not been taking her prescribed anticoagulant medication. She is writhing in pain. Vital signs show a temperature of 37.1°C (98.8°F), pulse of 122/min and irregularly irregular, blood pressure of 135/85 mm Hg, and respiratory rate of 22/min. Physical examination reveals a soft abdomen with mild, diffuse tenderness to deep palpation, without any guarding, rigidity, or rebound tenderness. Bowel sounds are diminished. An electrocardiogram confirms atrial fibrillation with a rapid ventricular response. Arrange the following steps in the most appropriate chronological order for diagnosing and managing this patient's condition.

  1. 1Resuscitate with intravenous isotonic crystalloids and provide adequate analgesia.
  2. 2Obtain a computed tomography (CT) angiography of the abdomen and pelvis.
  3. 3Initiate systemic anticoagulation with heparin and administer broad-spectrum antibiotics.
  4. 4Perform an exploratory laparotomy for surgical embolectomy and resection of frankly necrotic bowel.
  5. 5Conduct a second-look laparotomy 24 to 48 hours after the initial operation.

Answer

The correct sequence is to first stabilize the patient with fluids and analgesia, followed by diagnostic confirmation using CT angiography. After diagnosis, medical therapy with anticoagulation and antibiotics is initiated, followed by definitive surgical exploration and revascularization. Finally, a second-look laparotomy is planned 24-48 hours later to reassess bowel viability.
Acute mesenteric ischemia requires a step-wise approach. Initial resuscitation stabilizes the patient. Because the patient has classic 'pain out of proportion to exam' without peritonitis, CT angiography is the safest next step to visualize the occlusion. Once confirmed, heparin prevents clot extension and antibiotics cover translocating gut flora. Surgery restores perfusion and removes dead tissue. Finally, a second-look laparotomy 24-48 hours later is standard practice to reassess borderline-viable bowel, preventing both short gut syndrome and missed necrosis.

Step-by-Step Solution

1
Assess hemodynamic stability and perform initial resuscitation.
The patient is stabilized with intravenous fluids and given pain relief.
Acute mesenteric ischemia causes profound intravascular volume depletion due to third-spacing, making fluid resuscitation the critical first step.
2
Determine the need for emergent surgery versus imaging based on physical exam.
Since the patient lacks peritonitis (soft abdomen, no guarding), CT angiography is obtained.
Immediate laparotomy is reserved for patients with peritonitis or hemodynamic instability. Stable patients without peritonitis require CT angiography to confirm the diagnosis and plan intervention.
3
Initiate adjunctive medical therapy.
Heparin and broad-spectrum antibiotics are started.
Anticoagulation halts clot propagation, while antibiotics treat or prevent bacteremia caused by loss of the ischemic mucosal barrier.
4
Proceed to definitive surgical management.
An exploratory laparotomy is performed for embolectomy and resection of dead bowel.
Restoring blood flow and removing necrotic tissue is necessary for survival.
5
Plan postoperative monitoring and reassessment.
A second-look laparotomy is scheduled.
Bowel viability can be difficult to determine during the initial operation; a planned re-exploration prevents excessive initial resection and avoids missing delayed necrosis.

Key Concept

The classic presentation of acute mesenteric ischemia is pain out of proportion to physical exam findings; management requires a sequential approach of resuscitation, CT angiography, medical adjuncts, surgical revascularization, and often a second-look laparotomy.
Rate this question

Topics

Gastrointestinal and Abdominal Surgery

More questions from this topic