A 45-year-old individual is evaluated in the emergency department for severe, progressive … — USMLE Step 2 CK

A 45-year-old individual is evaluated in the emergency department for severe, progressive abdominal pain and persistent vomiting of greenish fluid over the past 24 hours. The patient reports an inability to pass flatus since the symptoms began. Past medical history is notable for a Roux-en-Y gastric bypass performed three years ago for severe obesity. Vital signs are temperature $38.8^\circ\text{C}$ ( $101.8^\circ\text{F}$ ), blood pressure $88/58\text{ mmHg}$ , heart rate $122\text{ /min}$ , and respiratory rate $22\text{ /min}$ . The patient appears acutely ill and diaphoretic. Abdominal examination reveals significant distension, diffuse tenderness to palpation, and involuntary guarding. Bowel sounds are absent. Laboratory studies demonstrate a leukocyte count of $19,000/\text{mm}^3$ and a serum lactate level of $4.2\text{ mmol/L}$ . Upright abdominal radiography shows multiple dilated loops of small bowel with prominent air-fluid levels and no gas in the rectum. Which of the following is the most appropriate next step in management?

Immediate exploratory laparotomyCevap
B
Nasogastric tube decompression and serial abdominal examinations
C
Computed tomography angiography of the abdomen
D
Administration of broad-spectrum antibiotics and admission to the intensive care unit
E
Upper gastrointestinal endoscopy

Cevap

Immediate exploratory laparotomy

The correct answer is immediate exploratory laparotomy. This patient presents with a classic clinical picture of a small bowel obstruction (SBO) complicated by bowel strangulation and ischemia. The history of a Roux-en-Y gastric bypass creates a high risk for internal hernias, which frequently cause closed-loop obstructions. The presence of systemic inflammatory response syndrome (fever, tachycardia, leukocytosis), hemodynamic instability (hypotension), peritoneal signs (involuntary guarding), and elevated lactate strongly indicate ischemic or necrotic bowel. In any patient with an acute surgical abdomen and hemodynamic instability, emergent operative intervention is required for source control to prevent irreversible shock and mortality.

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Analyze the patient's symptoms and surgical history

Severe abdominal pain, bilious emesis, obstipation, and a history of Roux-en-Y gastric bypass suggest a small bowel obstruction, likely due to an internal hernia.

Prior abdominal surgery, especially Roux-en-Y, creates mesenteric defects where bowel can become trapped (e.g., Petersen's space).

Evaluate vital signs and physical examination findings

The patient exhibits fever, hypotension, tachycardia, and a rigid abdomen with involuntary guarding.

These findings indicate systemic inflammatory response syndrome (SIRS) and peritonitis, moving the diagnosis from a simple obstruction to a complicated/strangulated obstruction.

Interpret the laboratory and radiographic data

Leukocytosis and elevated lactate strongly support bowel ischemia. X-rays confirm a high-grade bowel obstruction.

Lactic acidosis in the setting of obstruction is a hallmark of tissue hypoperfusion and bowel necrosis.

Determine the most appropriate management based on clinical stability

Immediate exploratory laparotomy is required.

Hemodynamically unstable patients with peritonitis require emergent surgical exploration; further imaging or conservative medical management will increase mortality.

Anahtar Kavram

Patients presenting with a small bowel obstruction complicated by hemodynamic instability, peritonitis, or signs of bowel ischemia (fever, leukocytosis, metabolic acidosis) require immediate exploratory laparotomy rather than conservative management or further imaging.

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Cevap

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