A 58-year-old man undergoes elective open cholecystectomy for chronic cholecystitis. The procedure is uncomplicated and lasts 45 minutes. On postoperative day 4, he develops fever (38.5°C), erythema, warmth, and purulent drainage from the surgical wound. Gram stain of the drainage shows gram-positive cocci in clusters. Which of the following is the MOST appropriate immediate management?

Explanation

## Diagnosis and Management of Surgical Site Infection (SSI) ### Clinical Presentation This patient presents with a **superficial incisional SSI** on postoperative day 4, characterized by: - Fever within 30 days of surgery - Purulent drainage from the incision - Local signs of inflammation (erythema, warmth) - Gram-positive cocci in clusters → **Staphylococcus aureus** (most common cause of SSI) ### Immediate Management Algorithm **Key Point:** Superficial incisional SSI requires **immediate wound opening and drainage**, not observation or empirical systemic therapy alone. ```mermaid flowchart TD A[Suspected SSI on POD 4]:::outcome --> B{Systemic toxicity or deep involvement?}:::decision B -->|No systemic signs, superficial| C[Bedside wound opening]:::action B -->|Systemic toxicity or deep concern| D[OR for formal exploration]:::action C --> E[Obtain culture & Gram stain]:::action E --> F[Start targeted antibiotics]:::action D --> G[Drain collection, culture]:::action G --> F F --> H[Daily dressing changes]:::action H --> I[Healing by secondary intention]:::outcome ``` ### Why Bedside Wound Opening? 1. **Immediate source control** — pus under tension causes systemic inflammation and delays healing 2. **Culture-directed therapy** — Gram stain already suggests *S. aureus*; culture confirms and guides antibiotic choice 3. **Prevents progression** — early drainage prevents spread to deeper planes (deep SSI) 4. **Cost-effective** — avoids unnecessary imaging and broad-spectrum antibiotics ### Management Sequence 1. **Bedside exploration** under local anesthesia (if superficial and patient stable) 2. **Obtain culture** from purulent material 3. **Leave wound open** for daily dressing changes 4. **Start antibiotics** based on Gram stain (anti-staphylococcal: nafcillin, oxacillin, or cephalexin if MSSA; vancomycin if MRSA risk) 5. **Reassess daily** for signs of deep involvement **High-Yield:** Superficial SSI does NOT require CT or imaging unless there is suspicion of deep/organ-space involvement (fever persists despite drainage, peritoneal signs, or imaging findings warrant it). **Clinical Pearl:** The presence of purulent drainage is diagnostic of infection; culture confirms the organism but should not delay source control.