Necrotizing Fasciitis Debridement
What the Examiner Expects
Emergency surgical debridement of necrotizing soft tissue infection, a life-threatening condition with mortality of 20–40% even with treatment. The examiner expects you to recognize the clinical signs (pain disproportionate to exam, rapidly spreading cellulitis with systemic toxicity, crepitus, gray necrotic fascia with dishwater-gray drainage, skin necrosis), NOT delay for imaging (CT may show fascial gas/fluid tracking but should not delay surgery), and proceed to immediate operative exploration. The key intraoperative finding is necrotic fascia that separates easily from underlying muscle with blunt finger dissection (positive finger test). All necrotic tissue must be debrided until healthy, bleeding tissue is encountered in all directions.
Key Examiner Focus Points
- Surgical emergency — early and aggressive debridement is the single most important intervention
- Debride all necrotic fascia and tissue until healthy, bleeding tissue is reached
- Hallmarks: pain out of proportion, crepitus, dishwater-gray drainage, rapidly spreading erythema
- Type I (polymicrobial): diabetics, immunocompromised; Type II (group A Strep or Clostridium): healthy patients
- Planned re-exploration every 24–48 hours until no further necrosis is found
Common Curveballs
The initial debridement appears adequate, but 24 hours later the wound edges are erythematous and advancing
Return to OR for re-debridement. Necrotizing fasciitis typically requires 2–3 (sometimes more) debridements. Plan on returning every 24–48 hours until no further necrosis is found at re-exploration. Under-debridement at the initial operation is the most common surgical error.
Perineal necrotizing fasciitis (Fournier's gangrene) with scrotal involvement
Aggressive debridement of all necrotic scrotal and perineal tissue. The testes are usually spared (separate blood supply from the testicular arteries). May require fecal diversion (diverting colostomy) to protect the wound from fecal contamination. Wound VAC and staged reconstruction after infection control.
Practice this topic with an AI-powered mock oral exam.
Browse Practice Cases