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Difficulty: HardGastrointestinal and Abdominal Surgery

A 36-year-old woman is brought to the emergency department due to a 6-hour history of sudden, severe, and relentless mid-abdominal pain that radiates to her back. The pain is accompanied by several episodes of retching and non-bilious vomiting. Her medical history is significant for a laparoscopic Roux-en-Y gastric bypass procedure performed three years ago for morbid obesity. She takes no daily medications. Upon arrival, her temperature is 38.4°C (101.1°F), pulse is 128/min, and blood pressure is 88/54 mm Hg after receiving 2 liters of intravenous crystalloids. Physical examination reveals an anxious, diaphoretic patient. The abdomen is slightly distended with marked periumbilical tenderness, striking involuntary guarding, and rebound tenderness. Bowel sounds are absent. Laboratory results demonstrate a leukocyte count of 17,200/mm³ and a serum lactate level of 4.1 mmol/L. Which of the following is the most appropriate next step in the management of this patient?

  1. Immediate exploratory laparotomyAnswer
  2. B
    Abdominopelvic computed tomography scan
  3. C
    Insertion of a nasogastric tube and observation
  4. D
    Intravenous administration of broad-spectrum antibiotics
  5. E
    Diagnostic esophagogastroduodenoscopy

Answer

Immediate exploratory laparotomy
The correct answer is immediate exploratory laparotomy. This patient is presenting with classic signs of an internal hernia complicated by bowel strangulation, a known life-threatening complication of Roux-en-Y gastric bypass. The creation of a Roux limb involves altering the native bowel anatomy, which inevitably creates artificial spaces (such as Petersen's space) through which loops of small bowel can herniate. When this occurs, it often creates a closed-loop obstruction, which has a very high risk of rapid progression to bowel ischemia, necrosis, and perforation. The clinical triad of hemodynamic instability (hypotension refractory to intravenous fluids), severe localized peritonitis (involuntary guarding and rebound tenderness), and biochemical evidence of tissue hypoperfusion/necrosis (marked leukocytosis and lactic acidosis) strictly mandates immediate surgical intervention. Any delay for imaging or conservative management significantly increases the risk of mortality.

Step-by-Step Solution

1
Analyze the patient's presentation and surgical history.
The patient has sudden, severe abdominal pain, vomiting, and a history of a Roux-en-Y gastric bypass, putting her at high risk for an internal hernia.
Prior creation of mesenteric defects during bypass surgery creates spaces where small bowel can herniate and become obstructed.
2
Assess the patient's hemodynamic status and physical examination findings.
The patient exhibits hypotension refractory to fluid resuscitation, tachycardia, fever, and diffuse peritonitis (guarding, rebound tenderness).
These findings are classic red flags indicating that a simple obstruction has progressed to bowel strangulation and necrosis.
3
Evaluate the laboratory results.
Significant leukocytosis and an elevated serum lactate level (4.1 mmol/L) are present.
An elevated lactate in the setting of an acute abdomen is a strong biochemical marker for tissue ischemia, specifically mesenteric ischemia in this context.
4
Determine the definitive next step in management.
The patient requires immediate surgical exploration.
Any patient with a suspected mechanical bowel obstruction who develops hemodynamic instability, peritonitis, or severe lactic acidosis must be taken to the operating room immediately to resect necrotic bowel and prevent death.

Key Concept

Patients with suspected small bowel obstruction who present with or develop signs of strangulation (fever, continuous pain, peritonitis, hemodynamic instability, or lactic acidosis) require emergent surgical exploration.
Estimated Time:1m 30s
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Topics

Gastrointestinal and Abdominal Surgery

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