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Necrotizing fasciitis is a rapidly spreading, life-threatening deep soft tissue infection that destroys fascia and subcutaneous tissue. It requires immediate surgical debridement and aggressive antibiotic therapy, with mortality rates ranging from 20-40% despite treatment. Early recognition and intervention are critical for survival and limb preservation.
The infection typically begins with bacterial invasion through a breach in skin integrity, often involving Group A Streptococcus, Clostridium species, or polymicrobial organisms. Bacterial toxins and enzymes cause rapid tissue necrosis, vascular thrombosis, and systemic toxicity through cytokine release. The infection spreads along fascial planes faster than through skin, creating extensive deep tissue damage that may not be apparent superficially.
Diagnosis requires high clinical suspicion as early signs may be subtle, with severe pain often disproportionate to physical findings being a key early indicator. The presence of systemic toxicity, skin changes (dusky discoloration, bullae, anesthesia), and rapid progression should prompt immediate surgical exploration. Laboratory findings including elevated white count, low sodium, and high creatine kinase support the diagnosis, but surgical visualization of necrotic fascia remains the gold standard.