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Difficulty: HardGastrointestinal and Abdominal Surgery

A 74-year-old man with a history of atrial fibrillation and congestive heart failure is brought to the emergency department due to sudden-onset, severe abdominal pain. The pain began 44 hours ago and was initially out of proportion to his physical examination findings. He has rapidly become lethargic. Vital signs show a blood pressure of 80/50 mm Hg80/50 \text{ mm Hg}, pulse of 130/min130/\text{min} and irregularly irregular, and respiratory rate of 24/min24/\text{min}. Abdominal examination reveals a distended abdomen with diffuse rebound tenderness and involuntary guarding. Laboratory studies show a leukocyte count of 22,000/mm322,000/\text{mm}^3 and a serum lactate of 8.5 mmol/L8.5 \text{ mmol/L}. Arrange the following management steps in the most appropriate chronological sequence for this patient.

  1. 1Establish large-bore intravenous access and initiate aggressive crystalloid resuscitation
  2. 2Perform an emergent exploratory laparotomy without delaying for advanced imaging
  3. 3Resect visibly necrotic bowel segments and leave the gastrointestinal tract in discontinuity
  4. 4Transfer to the intensive care unit for continued physiological optimization
  5. 5Perform a scheduled second-look laparotomy for reassessment and possible anastomosis

Answer

The correct sequence begins with initial hemodynamic resuscitation, followed immediately by an emergent laparotomy, damage-control bowel resection, intensive care physiological optimization, and finally a second-look laparotomy.
This patient presents with classic signs of acute mesenteric ischemia (sudden pain initially out of proportion to exam in a patient with atrial fibrillation) that has progressed to full-thickness bowel infarction, evidenced by septic shock, severe lactic acidosis, and diffuse peritonitis. In any unstable patient with an acute surgical abdomen, initial management must prioritize ABCs (Airway, Breathing, Circulation), meaning aggressive IV fluid resuscitation is the absolute first step. Because the patient has overt peritonitis and hemodynamic instability, advanced imaging (such as a CT angiogram) is contraindicated as it delays definitive, life-saving treatment. Emergent exploratory laparotomy is the required next step. During laparotomy in an unstable patient, 'damage control' principles apply: the surgeon should quickly resect visibly necrotic bowel and leave the gastrointestinal tract in discontinuity with a temporary abdominal closure. The patient is then transferred to the intensive care unit for physiological optimization, which involves the correction of acidosis, hypothermia, and coagulopathy. Once the patient is stabilized, typically 2424 to 4848 hours later, a scheduled second-look laparotomy is performed to re-evaluate the viability of the remaining bowel and restore continuity.

Step-by-Step Solution

1
Recognize the clinical triad of atrial fibrillation, pain out of proportion, and septic shock.
Diagnosis of acute mesenteric ischemia complicated by bowel infarction and peritonitis.
Identifying the etiology and severity determines the immediate urgency of surgical intervention.
2
Identify the patient's severe hemodynamic instability and generalized peritonitis.
Determine that advanced imaging (e.g., CT angiography) is strictly contraindicated.
Unstable patients with peritonitis require immediate operative intervention without delay for diagnostic imaging.
3
Apply the principles of damage control surgery during the laparotomy.
Sequence the operative management: rapid resection, ICU optimization, then a second-look laparotomy.
Prolonged operations (like primary anastomosis) in a patient with the lethal triad (acidosis, hypothermia, coagulopathy) have a prohibitively high mortality rate.

Key Concept

Damage control surgery and phased management of acute mesenteric ischemia with peritonitis
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Topics

Gastrointestinal and Abdominal Surgery

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