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Difficulty: MediumSurgical and Procedural Interventions

A 54-year-old woman is evaluated in the hospital on the second day of her admission for a mechanical small bowel obstruction. She originally presented with cramping abdominal pain, bilious vomiting, and failure to pass flatus. Her surgical history is notable for a total abdominal hysterectomy performed 55 years ago. Initial management included bowel rest, intravenous fluid resuscitation, and nasogastric tube decompression. Over the last 44 hours, her abdominal pain has transitioned from intermittent cramps to a severe, constant ache. Her temperature is 38.6∘C38.6^\circ\text{C} (101.5∘F101.5^\circ\text{F}), blood pressure is 98/60 mm Hg98/60\text{ mm Hg}, and pulse is 115/min115/\text{min}. Physical examination now reveals a rigid, distended abdomen with significant rebound tenderness and involuntary guarding in all four quadrants. Laboratory studies obtained 30 minutes30\text{ minutes} ago show a leukocyte count of 16,500/mm316,500/\text{mm}^3 and a serum lactate level of 4.2 mmol/L4.2\text{ mmol/L}. Which of the following is the most appropriate next step in the management of this patient?

  1. Exploratory laparotomyAnswer
  2. B
    Computed tomography of the abdomen and pelvis with intravenous contrast
  3. C
    Administration of intravenous metoclopramide
  4. D
    Upper gastrointestinal series with water-soluble contrast
  5. E
    Initiation of broad-spectrum intravenous antibiotics and continued nasogastric decompression

Answer

Exploratory laparotomy
The correct answer is to proceed immediately to the operating room. This patient's clinical presentation has evolved from a simple mechanical small bowel obstruction (managed initially with bowel rest and nasogastric decompression) to a complicated, strangulated obstruction. The transition to severe, constant pain, along with the development of fever, tachycardia, leukocytosis, elevated serum lactate, and generalized peritonitis (rebound tenderness, guarding, rigidity), strongly indicates bowel ischemia and possible perforation. The standard of care for a patient with signs of peritonitis and bowel ischemia is immediate surgical intervention via exploratory laparotomy to resect the necrotic bowel and address the source of the obstruction. Delaying surgery for further diagnostic testing or prolonged medical management significantly increases mortality.

Step-by-Step Solution

1
Evaluate the patient's evolving clinical symptoms and vital signs.
The patient demonstrates new-onset fever, tachycardia, hypotension, and a transition from colicky to severe, constant abdominal pain.
To identify clinical deterioration that suggests a shift from simple mechanical obstruction to a complicated state.
2
Correlate the physical examination findings with recent laboratory results.
A rigid, distended abdomen with generalized rebound tenderness, combined with significant leukocytosis and elevated serum lactate, indicates generalized peritonitis and bowel ischemia.
To differentiate between a simple mechanical obstruction that can be managed conservatively and a strangulated obstruction that requires escalation of care.
3
Determine the definitive procedural intervention based on the diagnosis of a strangulated small bowel obstruction.
Immediate exploratory laparotomy is required.
When a patient exhibits clear signs of peritonitis and ischemic bowel, conservative management must be abandoned in favor of prompt surgical resection of the necrotic tissue to prevent overwhelming sepsis and death.

Key Concept

Indications for emergent exploratory laparotomy in patients with complicated small bowel obstruction
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Topics

Surgical and Procedural Interventions

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