Emergency medical services bring a 74-year-old woman to the acute care center due to a sud… — USMLE Step 2 CK

Emergency medical services bring a $74$ -year-old woman to the acute care center due to a sudden deterioration in her clinical status. She resides in an assisted living facility and has a surgical history significant for multiple open pelvic operations. Caregivers report that she began experiencing intermittent, crampy abdominal discomfort two days ago, which abruptly transitioned into unrelenting, severe diffuse pain over the last three hours. Upon arrival, she is lethargic. Vital signs reveal a temperature of $39.1^\circ\text{C}$ ( $102.4^\circ\text{F}$ ), a heart rate of $128/\text{min}$ , and a blood pressure of $82/48\text{ mm Hg}$ . Physical assessment reveals a significantly distended abdomen with marked involuntary guarding and rebound tenderness in all four quadrants. Auscultation reveals absent bowel sounds. A point-of-care abdominal radiograph demonstrates markedly dilated small bowel loops and an absence of distal colonic gas. Which of the following is the most appropriate next step in management?

Open abdominal explorationAnswer
B
Gastric decompression and intravenous fluid resuscitation
C
Computed tomography of the abdomen with intravenous contrast
D
Diagnostic laparoscopy
E
Broad-spectrum antimicrobial therapy and clinical observation

Answer

Open abdominal exploration

The correct answer is open abdominal exploration. This patient presents with classic signs of a small bowel obstruction (SBO) that has progressed to strangulation and ischemia. While uncomplicated SBOs typically present with colicky abdominal pain and are initially managed conservatively with bowel rest and decompression, this patient's clinical picture has drastically changed. The transition to severe, unrelenting pain, combined with fever, tachycardia, hypotension, and generalized peritonitis (involuntary guarding, rebound tenderness), strongly suggests bowel necrosis and perforation. In any patient with an acute surgical abdomen accompanied by hemodynamic instability, immediate open surgical exploration is mandatory to resect ischemic tissue and achieve source control.

Step-by-Step Solution

Identify the primary diagnosis based on the clinical presentation and radiographic findings.

The patient has a small bowel obstruction (SBO), likely secondary to adhesions from previous pelvic surgeries, as evidenced by crampy pain, prior operations, and dilated small bowel loops without distal gas.

Establishing the underlying mechanical issue is the first step in determining the management algorithm.

Evaluate for the presence of complicating features such as ischemia, strangulation, or perforation.

The patient exhibits severe constant pain, high fever (

39.1^\circ\text{C}

), tachycardia (

128/\text{min}

), hypotension (

82/48\text{ mm Hg}

), and diffuse peritonitis (rebound tenderness and guarding).

Identifying red flags is crucial because complicated SBOs require immediate surgical intervention rather than conservative therapy.

Determine the definitive treatment required for a complicated, hemodynamically unstable acute abdomen.

The patient requires urgent source control and resection of likely necrotic bowel via open abdominal exploration.

Delays for advanced imaging or attempts at conservative management in a hemodynamically unstable patient with generalized peritonitis drastically increase mortality.

Key Concept

Patients presenting with a small bowel obstruction complicated by peritonitis, hemodynamic instability, or signs of bowel ischemia (fever, tachycardia, constant pain) require immediate surgical exploration.

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