Management of Deep Tissue Infections

Initial Assessment and Classification

The World Journal of Emergency Surgery recommends assessing the severity of infection based on local and systemic signs to classify as mild, moderate, or severe, with classifications including Class 1: No signs of systemic toxicity or comorbidities, Class 2: Systemically unwell with stable comorbidities or systemically well with complicating comorbidities, Class 3: Toxic appearance, and Class 4: Sepsis syndrome and life-threatening infection 1, 3
Evaluate for signs suggesting necrotizing infection requiring immediate surgical intervention, including pain disproportionate to physical findings, violaceous bullae, skin sloughing or anesthesia, rapid progression, and gas in tissue 4, 6

Obtain plain radiographs of the affected extremity to evaluate for bony abnormalities, soft tissue gas, or foreign bodies 8, 9
Consider obtaining tissue specimens for culture and Gram stain via needle aspiration, tissue biopsy, or swab of purulent drainage 2, 4, 6, 7

Initiate broad-spectrum empiric antibiotics for moderate to severe infections with systemic signs, including Gram-positive coverage with vancomycin, linezolid, or daptomycin, and Gram-negative/anaerobic coverage with piperacillin-tazobactam, carbapenem, ceftriaxone plus metronidazole, or fluoroquinolone plus metronidazole 1, 4, 7, 8, 9
Duration of therapy should be guided by clinical response, typically 5-14 days for soft tissue infections without osteomyelitis 4, 7

Surgical consultation is recommended for all patients with deep tissue infections and signs of systemic toxicity, with indications for surgical intervention including abscess formation requiring drainage, extensive or advancing cellulitis, suspicion of necrotizing infection, presence of gas in tissues, and compartment syndrome 1, 2, 4, 5, 6
For abscesses, incision and drainage is the primary treatment, and for necrotizing infections, aggressive and early surgical debridement is essential 2, 4, 5

For diabetic patients with lower extremity infections, evaluate for underlying osteomyelitis and consider more aggressive management 8, 9
Consider decolonization regimens for patients with recurrent staphylococcal infections 7

Reassess within 24-48 hours to evaluate response to therapy, and consider repeat surgical debridement if clinical improvement is not observed 4, 5, 9
Adjust antibiotics based on culture results and clinical response, and monitor for complications such as bacteremia, osteomyelitis, or sepsis 4, 5, 9