Management of Soft Tissue Infections

Initial Assessment and Classification

The initial management of soft tissue infections requires prompt empiric antimicrobial therapy targeting the most likely pathogens, with treatment selection based on infection severity, anatomical location, and patient risk factors 1, 2
Soft tissue infections should be classified based on necrotizing vs. non-necrotizing character, anatomical extension, purulent vs. non-purulent presentation, and patient's clinical condition 3
Evaluate for signs of systemic toxicity, including fever, tachycardia, hypotension, and altered mental status 4
Assess for signs of necrotizing infection, such as pain out of proportion to physical findings, edema extending beyond erythema, rapid progression, crepitus or tissue gas, and skin necrosis or ecchymosis 1, 2, 4

For non-necrotizing infections, oral antibiotics active against Staphylococcus aureus and Streptococcus species are recommended for mild to moderate infections 1
For moderate to severe non-necrotizing infections, intravenous antibiotics with activity against MRSA and beta-hemolytic streptococci are recommended 1
For necrotizing infections, immediate broad-spectrum antimicrobial coverage is essential, including coverage for MRSA and anaerobic bacteria 2, 4
Recommended empiric regimen for necrotizing infections includes vancomycin, linezolid, or daptomycin, plus piperacillin-tazobactam, a carbapenem, ceftriaxone plus metronidazole, or a fluoroquinolone plus metronidazole 1, 5

Superficial and small abscesses can be treated with incision and drainage, while antibiotics may not be necessary after adequate drainage 6
For necrotizing infections, urgent surgical consultation for debridement is essential, and surgical debridement should not be delayed while waiting for antibiotic response 2, 6
Consider negative pressure wound therapy after complete removal of necrosis 7

For non-necrotizing infections, 5-10 days of therapy is typically sufficient 1
For necrotizing infections, continue antimicrobial therapy until no further debridement is necessary, patient has improved clinically, and fever has been absent for 48-72 hours 1, 5
Immunocompromised patients require early treatment and broader antimicrobial coverage for atypical organisms, and consider fungal infections in the differential diagnosis 8, 9
Diabetic patients are at increased risk for developing necrotizing infections and may require more aggressive surgical management 2, 5