A 52-year-old man undergoes elective open cholecystectomy for symptomatic cholelithiasis. The surgery is uncomplicated and lasts 45 minutes. On postoperative day 5, he develops fever (38.5°C), erythema, induration, and purulent discharge from the surgical wound. Gram stain of the discharge shows gram-positive cocci in clusters. Culture is pending. What is the most appropriate immediate management?

Explanation

## Diagnosis: Surgical Site Infection (SSI) — Superficial Incisional Type **Key Point:** The clinical presentation (fever on POD 5, wound erythema, induration, purulent discharge) and gram-positive cocci morphology are classic for *Staphylococcus aureus* SSI, the most common causative organism in clean-contaminated surgery. ### Why Immediate Drainage Is Essential **High-Yield:** SSI with purulent discharge requires **urgent wound exploration and drainage**, not antibiotics alone. Pus under tension impairs antibiotic penetration and delays healing. **Clinical Pearl:** Gram-positive cocci in clusters = *Staphylococcus aureus* until proven otherwise. This organism is the leading cause of SSI in clean and clean-contaminated procedures. ### Management Algorithm ```mermaid flowchart TD A[SSI with purulent discharge]:::outcome --> B{Systemic toxicity?}:::decision B -->|Yes| C[Urgent OR for formal exploration]:::action B -->|No| D[Bedside drainage if superficial]:::action C --> E[Send culture, Gram stain]:::action D --> E E --> F[Start empirical anti-Staph coverage]:::action F --> G[Nafcillin or Cefazolin IV]:::action G --> H[De-escalate when culture/sensitivities available]:::action ``` ### Antibiotic Choice | Agent | Indication | Notes | |-------|-----------|-------| | **Nafcillin / Oxacillin** | MSSA (methicillin-susceptible *S. aureus*) | First-line for community-acquired SSI | | **Cefazolin** | MSSA, perioperative prophylaxis coverage | Acceptable alternative | | **Vancomycin** | MRSA or β-lactam allergy | Reserve for resistant organisms | | **Ceftriaxone + Metronidazole** | Biliary/GI tract contamination | Unnecessary here; *S. aureus* is the issue | **Warning:** Broad-spectrum agents (ceftriaxone + metronidazole) are overkill for a clean-contaminated case with clear *Staphylococcus* morphology. They increase resistance pressure and do not improve outcomes for SSI. ### Timing and Culture **Key Point:** Culture must be obtained **before** antibiotics whenever possible, but do not delay drainage for culture results. Start empirical anti-staphylococcal coverage immediately after sampling. [cite:Sabiston Textbook of Surgery Ch 12]