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Difficulty: MediumGastrointestinal and Abdominal Surgery

A 52-year-old man presents to the emergency department with a 48-hour history of severe, colicky abdominal pain accompanied by nausea and multiple episodes of bilious vomiting. He reports no passage of flatus or stool for the past 24 hours. His surgical history is significant for an open appendectomy performed 15 years ago. On initial evaluation, his temperature is 37.1°C (98.8°F), heart rate is 88/min, blood pressure is 130/80 mm Hg, and respiratory rate is 16/min. The abdomen is markedly distended and tympanic, with high-pitched, tinkling bowel sounds and mild diffuse tenderness, but no rebound tenderness or guarding.

Arrange the following interventions in the correct sequential order for the management of this patient, from initial presentation to ultimate definitive care.

  1. 1Initiate intravenous isotonic fluid resuscitation and place a nasogastric tube.
  2. 2Obtain a computed tomography (CT) scan of the abdomen and pelvis with intravenous contrast.
  3. 3Admit the patient for a trial of nonoperative management with serial abdominal examinations.
  4. 4Perform an urgent exploratory laparotomy after the patient develops fever, tachycardia, and localized abdominal rigidity.

Answer

The correct sequence is: initial fluid resuscitation and nasogastric decompression, followed by diagnostic CT imaging, admission for conservative management, and finally exploratory laparotomy when clinical signs of strangulation develop.
The management of small bowel obstruction follows a strict, step-wise algorithm. Initial stabilization with intravenous fluids and nasogastric tube decompression is paramount to address profound dehydration (due to third-spacing and emesis) and to decompress the proximal gastrointestinal tract. Subsequently, a CT scan is the imaging modality of choice to confirm the diagnosis, identify the specific transition point, and evaluate for early complications. Because the patient initially presented with normal vital signs and no peritonitis, a trial of conservative management with serial abdominal exams is the standard of care. However, if the patient's clinical status deteriorates with signs of bowel ischemia (new-onset fever, tachycardia, or localized peritonitis) during observation, the management sequence mandates immediate surgical intervention via an exploratory laparotomy.

Step-by-Step Solution

1
Evaluate the initial clinical presentation consisting of obstipation, bilious vomiting, and prior abdominal surgery.
Identify adhesive small bowel obstruction as the most likely primary diagnosis.
Recognizing the syndrome dictates the immediate triage pathway.
2
Determine the most critical immediate interventions for a patient with acute mechanical bowel obstruction.
Select intravenous fluid administration and nasogastric tube decompression.
Intravascular depletion from third-spacing and vomiting requires prompt correction, and decompression prevents aspiration.
3
Select the appropriate diagnostic modality to characterize the obstruction.
Order a contrast-enhanced CT scan of the abdomen and pelvis.
CT is the gold standard to identify the transition point, severity, and any early signs of bowel ischemia.
4
Establish a disposition plan for a stable patient with no signs of peritonitis on exam or ischemia on imaging.
Admit for nonoperative management and serial clinical exams.
Most adhesive small bowel obstructions resolve with conservative care, avoiding the morbidity of unnecessary surgery.
5
Identify the indication for operative intervention during the patient's hospital stay.
Proceed to exploratory laparotomy when signs of peritonitis (rigidity) and sepsis (fever, tachycardia) manifest.
Clinical deterioration indicates failure of conservative management and highly probable bowel strangulation.

Key Concept

Sequential management of adhesive small bowel obstruction
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Topics

Gastrointestinal and Abdominal Surgery

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