An emergency response team is called to evaluate a 61-year-old male in the observation uni… — USMLE Step 2 CK

An emergency response team is called to evaluate a 61-year-old male in the observation unit. Six hours earlier, the patient presented to the emergency department with a painful, non-reducible right groin mass that had been present for 10 hours. An emergency physician performed a bedside manual reduction under procedural sedation, which successfully flattened the groin bulge. However, the patient has since developed relentless, diffuse abdominal pain and two episodes of bilious emesis. Current vital signs are temperature 38.3°C (100.9°F), heart rate 124/min, blood pressure 92/58 mm Hg, and respiratory rate 22/min. Physical examination reveals an empty right inguinal canal with no overlying skin changes. The abdomen is markedly distended, with rigid musculature, diffuse rebound tenderness, and absent bowel sounds. Laboratory testing demonstrates a leukocyte count of 19,500/mm³ and a serum lactate of 4.6 mmol/L. Which of the following is the most appropriate next step in management?

A
Computed tomography of the abdomen and pelvis with intravenous contrast
B
Diagnostic laparoscopy
Immediate exploratory laparotomyAnswer
D
Nasogastric tube insertion, intravenous antibiotics, and serial examinations
E
Urgent right inguinal exploration and tissue repair

Answer

Immediate exploratory laparotomy

The correct answer is immediate exploratory laparotomy. This patient's presentation is highly suspicious for a catastrophic complication of manual hernia reduction. When an inguinal hernia has been incarcerated for a prolonged period (e.g., >6-8 hours), the trapped bowel becomes ischemic. Manually reducing this mass can result in pushing frankly necrotic bowel back into the peritoneal cavity, or it can cause a "reduction en masse." In a reduction en masse, the entire hernial sac and its constricting fascial ring are dislodged and reduced into the preperitoneal space or peritoneal cavity. The external bulge disappears, but the bowel remains strangulated inside the internal sac. The patient's subsequent development of rigid peritonitis, hypotension, and marked lactic acidosis indicates severe bowel ischemia and systemic toxicity. Hemodynamically unstable patients with peritonitis must bypass imaging and proceed directly to the operating room for an open exploratory laparotomy to resect the necrotic bowel and achieve source control.

Step-by-Step Solution

Analyze the clinical history and mechanism of injury.

The patient had a prolonged incarcerated hernia (10 hours) that was manually reduced, followed by severe clinical deterioration.

Prolonged incarceration leads to bowel ischemia. Manual reduction of such hernias risks either reducing frankly necrotic bowel into the peritoneal cavity or causing a 'reduction en masse' (where the hernial sac and constricting ring are pushed into the abdomen together, maintaining the obstruction internally).

Evaluate the current physical examination and vital signs.

The patient demonstrates fever, tachycardia, hypotension, severe lactic acidosis, and a rigid abdomen with diffuse peritonitis.

These findings indicate intra-abdominal catastrophe (ischemic, strangulated, or perforated bowel) leading to septic shock.

Determine the definitive management strategy.

The patient requires immediate exploratory laparotomy.

In any patient with a highly suspicious mechanism for ischemic bowel presenting with frank peritonitis and hemodynamic instability, time-consuming imaging or minimally invasive approaches are contraindicated. Open laparotomy provides the fastest source control and safest exposure.

Key Concept

Patients who develop peritonitis and shock following the manual reduction of an incarcerated hernia likely have reduction en masse or reduction of necrotic bowel, necessitating immediate exploratory laparotomy.

Question

Answer

Step-by-Step Solution

Key Concept

Common Mistakes

Topics

More questions from this topic