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Difficulty: HardGastrointestinal and Abdominal Surgery

A 34-year-old female presents to the triage desk with a 6-hour history of sudden-onset, severe, and unrelenting periumbilical pain. She reports multiple episodes of bilious vomiting and an inability to keep any oral intake down since the pain began. Her surgical history is notable for a laparoscopic Roux-en-Y gastric bypass performed two years ago for severe obesity, resulting in a 45-kg (99-lb) weight loss. Her temperature is 38.6°C (101.5°F), blood pressure is 92/58 mmHg, pulse is 128/min, and respirations are 24/min. Physical examination reveals a markedly distended abdomen. There is diffuse tenderness to palpation, most prominent in the periumbilical region, with severe involuntary guarding and rebound tenderness. Bowel sounds are absent. Laboratory studies show a leukocyte count of 18,000/mm³ and a serum lactate level of 5.1 mmol/L. Which of the following is the most appropriate next step in the management of this patient?

  1. Urgent surgical explorationAnswer
  2. B
    Placement of a nasogastric tube and serial abdominal examinations
  3. C
    Contrast-enhanced computed tomography of the abdomen and pelvis
  4. D
    Esophagogastroduodenoscopy
  5. E
    Initiation of broad-spectrum antimicrobial therapy and observation

Answer

Urgent surgical exploration
The correct answer is urgent surgical exploration. This patient presents with a classic clinical picture of a closed-loop small bowel obstruction, which is highly suspicious for an internal hernia (e.g., Petersen's space hernia)—a known, serious complication of Roux-en-Y gastric bypass. The presence of fever, tachycardia, hypotension, marked leukocytosis, elevated serum lactate, and diffuse peritonitis (involuntary guarding and rebound tenderness) strongly indicates that the bowel is ischemic and strangulated. When a patient exhibits overt peritonitis or hemodynamic instability in the setting of an acute abdomen, the standard of care is emergent surgical exploration to resect necrotic tissue and relieve the obstruction. Delaying surgery for imaging or a trial of conservative management drastically increases mortality.

Step-by-Step Solution

1
Analyze the patient's history and presenting symptoms.
The patient has a history of Roux-en-Y gastric bypass (RYGB) and presents with acute, severe periumbilical pain and bilious emesis.
Patients with prior RYGB are at high risk for internal hernias (such as a Petersen's space hernia), which typically present as a closed-loop small bowel obstruction.
2
Evaluate the vital signs and physical examination findings.
The patient is febrile, tachycardic, and hypotensive. The abdomen exhibits involuntary guarding and rebound tenderness (peritonitis).
These findings represent a toxic, unstable patient with an acute surgical abdomen, signifying that the obstruction has likely progressed to bowel ischemia or perforation.
3
Interpret the laboratory results in the context of the clinical picture.
Leukocytosis (18,000/mm³) and significantly elevated lactate (5.1 mmol/L) confirm systemic toxicity and tissue hypoperfusion/ischemia.
Elevated lactate in the setting of mechanical bowel obstruction is highly specific for strangulation and necrosis.
4
Determine the optimal management strategy based on the diagnosis of strangulated bowel obstruction.
Immediate surgical intervention (exploratory laparotomy or laparoscopy) is required.
When clear signs of bowel ischemia or perforation are present, diagnostic imaging and conservative measures must be bypassed to prevent further bowel necrosis, sepsis, and death.

Key Concept

Patients with signs of strangulated small bowel obstruction (fever, tachycardia, leukocytosis, lactic acidosis, and peritonitis) require immediate surgical exploration without delay for further diagnostic imaging or conservative management.
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Topics

Gastrointestinal and Abdominal Surgery

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