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Difficulty: HardGastrointestinal and Abdominal Surgery

An urgent surgical consultation is requested for a 6767-year-old male who was admitted three days ago with a partial small bowel obstruction. He has a history of an exploratory laparotomy for a perforated appendix in his twenties. For the first two days of his current admission, he was managed with intravenous fluids, bowel rest, and nasogastric tube decompression. Over the past six hours, his abdominal pain transitioned from intermittent and crampy to severe and unremitting. Current vital signs include a temperature of 38.9∘C38.9^\circ\text{C} (102.0∘F102.0^\circ\text{F}), a pulse of 124/min124/\text{min}, a blood pressure of 88/52 mm Hg88/52 \text{ mm Hg}, and respirations of 24/min24/\text{min}. On physical examination, the patient lies completely still in bed. His abdomen is tightly distended with diffuse rigidity, involuntary guarding, and marked rebound tenderness. Laboratory analysis demonstrates a leukocyte count of 19,500/mm319,500/\text{mm}^3 and an arterial lactate concentration of 4.6 mmol/L4.6 \text{ mmol/L}. Which of the following represents the most appropriate next step in the care of this patient?

  1. Immediate exploratory laparotomyAnswer
  2. B
    Continued nasogastric tube decompression and serial abdominal examinations
  3. C
    Computed tomography of the abdomen and pelvis with intravenous contrast
  4. D
    Initiation of broad-spectrum antibiotics and intensive care unit observation
  5. E
    Diagnostic laparoscopy

Answer

Immediate exploratory laparotomy is the most appropriate next step in management.
The correct action is immediate open surgical exploration. This patient exhibits classic signs of a complicated (strangulated or perforated) small bowel obstruction. The transition from crampy pain to severe, constant pain, accompanied by fever, hypotension, marked leukocytosis, and an elevated lactate level, points to mesenteric ischemia secondary to a closed-loop obstruction or adhesive band. Furthermore, the physical examination reveals frank peritonitis (rigidity, involuntary guarding, rebound tenderness). In any patient presenting with an acute surgical abdomen and hemodynamic instability, emergent exploratory laparotomy is the gold standard for both definitive diagnosis and life-saving therapeutic intervention (e.g., resection of necrotic bowel).

Step-by-Step Solution

1
Analyze the patient's initial presentation and current clinical trajectory.
The patient initially had a partial small bowel obstruction managed conservatively, but has acutely decompensated with severe, unremitting pain.
Tracking the progression of symptoms distinguishes between a resolving obstruction and one complicated by ischemia or perforation.
2
Evaluate the vital signs and physical examination findings.
The patient exhibits fever (38.9∘C38.9^\circ\text{C}), tachycardia (124/min124/\text{min}), hypotension (88/52 mm Hg88/52 \text{ mm Hg}), and frank peritonitis (rigidity, guarding, rebound tenderness).
These findings are cardinal signs of a surgical emergency, specifically an acute abdomen with systemic inflammatory response syndrome (SIRS)/sepsis.
3
Interpret the laboratory results.
Leukocytosis (19,500/mm319,500/\text{mm}^3) and elevated lactate (4.6 mmol/L4.6 \text{ mmol/L}) are present.
Elevated lactate in the setting of obstruction strongly suggests bowel ischemia (strangulation).
4
Determine the definitive management strategy based on the diagnosis of a strangulated small bowel obstruction.
The patient requires immediate exploratory laparotomy.
Hemodynamic instability combined with peritonitis necessitates emergent open surgical exploration for source control; conservative measures or further imaging will fatally delay care.

Key Concept

Management of complicated (strangulated) small bowel obstruction
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Topics

Gastrointestinal and Abdominal Surgery

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