A 35-year-old man from rural India presents with a 4-day history of right lower quadrant pain, fever (39.5°C), and vomiting. On examination, he has a rigid abdomen with rebound tenderness and absent bowel sounds. WBC is 16,200/μL with left shift. Abdominal X-ray shows free air under the diaphragm. What is the most appropriate immediate management?

Explanation

## Clinical Diagnosis: Perforated Appendicitis **Key Point:** Free air under the diaphragm in a patient with acute abdomen, fever, and signs of peritonitis is a surgical emergency. Immediate resuscitation and emergency open surgery (not laparoscopy) is the standard of care. ## Pathophysiology of Perforation 1. **Timeline:** Perforation typically occurs 24–72 hours after symptom onset if untreated. 2. **Mechanism:** Transmural inflammation → necrosis → rupture → peritonitis and sepsis. 3. **Complications:** Localized or generalized peritonitis, septic shock, multi-organ failure. ## Management Algorithm for Perforated Appendicitis ```mermaid flowchart TD A[Perforated appendicitis<br/>Free air + peritonitis]:::outcome --> B[Immediate resuscitation]:::action B --> C[IV fluids, broad-spectrum antibiotics]:::action C --> D[Emergency open appendicectomy]:::action D --> E[Drain peritoneal cavity if abscess]:::action E --> F[Postoperative ICU monitoring]:::outcome classDef outcome fill:#3b82f6,stroke:#1e40af,color:#fff classDef action fill:#10b981,stroke:#047857,color:#fff ``` ## Why Open Surgery (Not Laparoscopy) for Perforation | Factor | Open Appendicectomy | Laparoscopic Appendicectomy | |--------|---------------------|-----------------------------| | **Peritoneal contamination** | Better source control; direct visualization | Risk of insufflation spreading infection | | **Abscess drainage** | Easier access and drainage | Limited drainage capability | | **Septic shock risk** | Lower risk with rapid source control | Higher risk with CO₂ insufflation | | **Indication in perforation** | **Gold standard** | Contraindicated | **High-Yield:** Perforated appendicitis with peritonitis = **open emergency surgery**. Laparoscopy is contraindicated because CO₂ insufflation may spread bacterial contamination and worsen sepsis. ## Pre-operative Resuscitation (Critical) 1. **IV fluid resuscitation:** 2–3 L crystalloid bolus; target urine output >0.5 mL/kg/hr. 2. **Broad-spectrum antibiotics:** Start immediately (do NOT wait for surgery). - Typical regimen: Ceftriaxone 2 g IV 12-hourly + Metronidazole 500 mg IV 8-hourly (or Piperacillin-tazobactam 4.5 g IV 6-hourly). 3. **Blood cultures:** Obtain before antibiotics if possible. 4. **Nasogastric tube:** Insert after resuscitation begins (decompression, prevent aspiration). 5. **Foley catheter:** Monitor urine output; assess renal perfusion. **Clinical Pearl:** Do NOT delay surgery for imaging confirmation. Free air on plain X-ray + clinical peritonitis = surgical emergency. CT is unnecessary and wastes critical time.