Gas glife-threatening necrotizing soft tissue infection commonly caused by the rapid proliferation and spread of from a contaminated wound. The clinical picture includes excruciating muscle pain, edema with subsequent skin discoloration (red-purple to black) and gas production. Crepitus, as well as a feathering pattern of gas in soft tissue imaging, are generally present. Without treatment, gas g is fatal in almost 100% of cases. Surgical debridement in combination with antibiotic therapy reduces this figure by half.(also known as clostridial myonecrosis) is a
- Path of infection: wounds with compromised blood supply create an optimal anaerobic environment for the proliferation of C. perfringens → necrosis that progresses within 24–36 hours
Ubiquitous C. perfringens spores contaminate a wound → bacterial reproduction under anaerobic conditions → ↑ secretion of exotoxins, especially C. perfringens alpha-toxin (a phospholipase lecithinase) → degradation of phospholipids → tissue destruction (myonecrosis), inhibition of leukocyte function, and gas production → gas separation into healthy tissue → further colonization and more local tissue destruction → further exacerbation of anaerobic conditions by the development of edema
- Incubation period: hours to days
Local signs and symptoms
- Excruciating muscle pain
- Massive edema with skin discoloration that progresses from bronze to red-purple to black and overlying bullae
- Sweet and foul-smelling or nonodorous discharge produced by anaerobic metabolic products
- Crepitus; : Palpation reveals crackling of the skin due to gas production (skin emphysema)
- Spreading infection (see “”)
- Systemic toxicity 
Gas g is a medical emergency that can rapidly progress to multi-organ failure.
Perfringens perforates: C. perfringens causes gas g that leads to severe tissue damage.
- Imaging: Radiography, CT, or MRI typically show a characteristic feathering pattern of the soft tissue.
- Laboratory tests
- Surgical exploration
- Necrotizing fasciitis
- infection; : may occur after an open wound is exposed to seawater contaminated with V. vulnificus
- Rhabdomyolysis 
The differential diagnoses listed here are not exhaustive.
- Surgical exploration and debridement: If applicable, amputation of the affected extremity may be necessary.
- Antibiotic therapy: penicillin plus clindamycin or tetracycline
- Assessment of compartment pressure if compartment syndrome is suspected
- Hyperbaric oxygenation use is controversial.
- Tetanus toxoid if indicated
Mortality rate 
- Untreated: ∼ 100%
- With appropriate treatment: 20–30%