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Difficulty: HardGastrointestinal and Abdominal Surgery

A 62-year-old woman is evaluated during morning rounds on the surgical ward. She was admitted 48 hours ago for management of a small bowel obstruction secondary to adhesions from a prior total abdominal hysterectomy. Initial management included bowel rest, intravenous fluid resuscitation, and nasogastric tube decompression. Over the last few hours, she reports that her previously intermittent, crampy abdominal pain has become unremitting, constant, and more severe. She has not had any bowel movements or passed flatus since admission. Her temperature is 38.3°C (100.9°F), blood pressure is 112/74 mmHg, pulse is 116/min, and respirations are 20/min. Physical examination reveals a distended abdomen with hypoactive bowel sounds. There is focal, severe tenderness with involuntary muscle spasm in the periumbilical region. Laboratory studies show a leukocyte count of 15,400/mm³ and a serum bicarbonate level of 16 mEq/L. Which of the following is the most appropriate next step in management?

  1. A
    Enteral administration of a hyperosmolar radiopaque contrast agent
  2. B
    Repeat tomographic imaging of the abdomen and pelvis with intravenous contrast
  3. C
    Initiation of broad-spectrum intravenous antimicrobial therapy and continued clinical observation
  4. Urgent surgical explorationAnswer
  5. E
    Percutaneous mesenteric endovascular angiography

Answer

Urgent surgical exploration is required due to signs of bowel strangulation (fever, continuous severe pain, focal peritonitis, leukocytosis, and metabolic acidosis).
The correct next step is urgent surgical exploration. This patient is exhibiting classic signs of a strangulated small bowel obstruction. While many cases of adhesive small bowel obstruction can initially be managed conservatively with bowel rest and nasogastric tube decompression, patients must be closely monitored for complications. A transition from colicky, intermittent pain to severe, unremitting, and constant pain is a major warning sign. Coupled with fever, tachycardia, localized peritoneal signs (involuntary muscle spasm/guarding), leukocytosis, and metabolic acidosis (indicated by low serum bicarbonate), there is a high suspicion for bowel wall ischemia and necrosis. Any delay to obtain further imaging or perform contrast studies increases the risk of frank perforation and fatal sepsis. Therefore, immediate surgical intervention is mandated.

Step-by-Step Solution

1
Analyze the initial presentation and hospital course.
The patient initially presented with an uncomplicated adhesive small bowel obstruction (SBO) and was appropriately managed nonoperatively with a nasogastric tube and fluids.
Establishes the baseline diagnosis and context.
2
Evaluate the new clinical findings and vital signs.
The patient developed a fever (38.3°C), tachycardia (116/min), unremitting constant pain (changed from colicky), and focal peritonism (involuntary muscle spasm).
These are red-flag symptoms indicating that the obstruction is no longer simple.
3
Interpret the laboratory results.
Leukocytosis (15,400/mm³) and a low serum bicarbonate (16 mEq/L, suggesting a high anion gap metabolic acidosis from elevated lactate) are present.
Confirms the clinical suspicion of bowel ischemia/strangulation resulting from closed-loop obstruction or severe venous congestion.
4
Determine the optimal management for complicated SBO.
Definitive management is immediate operative intervention to resect necrotic tissue and relieve the obstruction.
Conservative measures will fail and delay in surgery leads to perforation and high mortality.

Key Concept

Management of Strangulated Small Bowel Obstruction
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Topics

Gastrointestinal and Abdominal Surgery

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