A 43-year-old gentleman arrives at the triage center reporting intermittent, cramping abdo… — USMLE Step 2 CK

A 43-year-old gentleman arrives at the triage center reporting intermittent, cramping abdominal pain that started $24\text{ hours}$ ago. He has had multiple episodes of greenish vomiting and has not passed flatus since yesterday. His past surgical history is notable for an exploratory laparotomy for a gunshot wound a decade ago. Vital signs show a heart rate of $98/\text{min}$ , blood pressure of $122/78\text{ mmHg}$ , and temperature of $37.3^\circ\text{C}$ ( $99.1^\circ\text{F}$ ). On physical examination, the abdomen is markedly distended with high-pitched 'tinkling' bowel sounds. There is generalized mild tenderness to palpation, but no rebound, rigidity, or guarding is elicited. Laboratory results reveal a leukocyte count of $8,500/\text{mm}^3$ and a normal basic metabolic panel. An abdominal CT scan with intravenous contrast demonstrates multiple dilated loops of small intestine with a distinct transition point in the mid-abdomen, decompressed colon, and normal bowel wall enhancement without free fluid or free air. Which of the following is the most appropriate next step in the management of this patient?

A
Urgent exploratory laparotomy
B
Initiation of broad-spectrum intravenous antibiotics
Nasogastric tube decompression and intravenous fluid resuscitationAnswer
D
Diagnostic laparoscopy
E
Barium contrast enema

Answer

Nasogastric tube decompression and intravenous fluid resuscitation

The patient presents with classic signs of a small bowel obstruction (SBO) secondary to intra-abdominal adhesions from a prior surgery. His stable hemodynamics, absence of fever, lack of peritoneal signs (rebound, rigidity), normal white blood cell count, and reassuring CT findings indicate an uncomplicated obstruction. The standard of care for an uncomplicated adhesive SBO is an initial trial of nonoperative management, which includes strict bowel rest, targeted intravenous fluid resuscitation to correct volume depletion from third-spacing and emesis, and placement of a nasogastric tube to decompress the stomach and proximal bowel.

Step-by-Step Solution

Identify the patient's primary diagnosis based on the clinical presentation and imaging.

The patient has a small bowel obstruction (SBO), evidenced by colicky abdominal pain, bilious emesis, obstipation, distension, prior abdominal surgery, and transition point on CT scan.

Establishing the diagnosis is the first step before determining the severity and appropriate management.

Evaluate for signs of complications, such as ischemia, strangulation, or perforation.

The patient has stable vital signs, lacks peritoneal signs (no rebound or guarding), has a normal leukocyte count, and the CT scan shows normal bowel wall enhancement without free air.

Differentiating between uncomplicated and complicated SBO dictates whether conservative or surgical management is required.

Select the appropriate initial treatment for an uncomplicated small bowel obstruction.

Conservative management with nasogastric tube decompression, intravenous fluids, and close observation is indicated.

Most partial or uncomplicated complete adhesive small bowel obstructions resolve without surgical intervention.

Key Concept

Patients with acute adhesive small bowel obstruction without clinical or radiologic signs of ischemia or perforation should undergo a trial of conservative management, including bowel rest, intravenous hydration, and nasogastric decompression.

Estimated Time:1m 0s

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