A 59-year-old man is brought to the emergency department by his partner due to severe, wor… — USMLE Step 2 CK

A $59$ -year-old man is brought to the emergency department by his partner due to severe, worsening perineal pain and fever for the past $24\text{ hours}$ . He has a $15$ -year history of type 2 diabetes mellitus complicated by peripheral neuropathy and nephropathy. His temperature is $39.4^\circ\text{C}$ ( $102.9^\circ\text{F}$ ), blood pressure is $84/52\text{ mmHg}$ , pulse is $124/\text{min}$ , and respirations are $22/\text{min}$ . Physical examination demonstrates marked edema, erythema, and induration of the perineum extending to the scrotum. There are several dark, necrotic bullae on the scrotal skin. Palpation of the affected area elicits exquisite pain and a crackling sensation beneath the skin. Laboratory evaluation reveals a leukocyte count of $26,000/\text{mm}^3$ and serum glucose of $480\text{ mg/dL}$ . Aggressive intravenous fluid resuscitation and broad-spectrum antibiotics are initiated. Which of the following is the most appropriate next step in management?

Emergent surgical exploration and extensive tissue debridementAnswer
B
Computed tomography (CT) scan of the abdomen and pelvis with intravenous contrast
C
Bedside incision and drainage of the scrotal bullae
D
De-escalation to targeted narrow-spectrum antibiotics based on local antibiogram
E
Continuous intravenous insulin infusion and clinical reassessment in 4 hours

Answer

Emergent surgical exploration and extensive tissue debridement

This patient's presentation of fever, hypotension, scrotal necrosis, and crepitus (subcutaneous gas) in the setting of poorly controlled diabetes is highly characteristic of Fournier gangrene. This polymicrobial necrotizing fasciitis of the perineal, perianal, and genital regions is a urologic surgical emergency. While intravenous fluid resuscitation and broad-spectrum antibiotics are critical initial steps, the definitive and life-saving intervention is emergent, aggressive surgical debridement of all necrotic and nonviable tissue. Any delay in achieving source control, such as waiting for imaging or metabolic optimization, significantly increases the risk of mortality.

Step-by-Step Solution

Analyze the clinical presentation and vital signs.

The patient has fever, severe hypotension, and tachycardia indicative of septic shock, along with perineal necrotic bullae and crepitus.

Identifying hemodynamic instability and the specific site of infection is necessary to determine the urgency and type of intervention.

Diagnose the underlying condition based on physical exam findings.

The presence of extreme perineal pain, necrotic skin changes, and subcutaneous gas (crepitus) in a diabetic patient establishes the clinical diagnosis of Fournier gangrene (necrotizing fasciitis of the perineum).

Fournier gangrene is a urologic surgical emergency with a high mortality rate that requires a specific treatment pathway.

Determine the most appropriate immediate next step following initial medical resuscitation.

Select emergent surgical exploration and extensive tissue debridement.

While fluids and broad-spectrum antibiotics are critical, definitive source control via radical surgical debridement cannot be delayed for imaging or medical optimization.

Key Concept

Management of Fournier gangrene requires immediate hemodynamic resuscitation, broad-spectrum antibiotics, and emergent surgical debridement of all necrotic tissue without delay for imaging.

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