A 58-year-old man with a long-standing left inguinal hernia presents to the emergency department with acute onset severe left lower abdominal pain, vomiting, and abdominal distension for 6 hours. On examination, the hernia is tense, tender, and non-reducible. Bowel sounds are absent over the hernia site. His vital signs show BP 98/62 mmHg, HR 118/min, temperature 38.2°C. Laboratory investigations reveal WBC 16,500/μL with left shift, and serum lactate 4.2 mmol/L. What is the most appropriate immediate management?

Explanation

## Clinical Diagnosis: Strangulated Inguinal Hernia **Key Point:** This patient presents with the classic tetrad of strangulation: irreducibility, severe pain, vomiting, and systemic signs (fever, tachycardia, elevated lactate). The tense, tender hernia with absent bowel sounds indicates compromised bowel viability. ## Why This Is Strangulation, Not Simple Obstruction | Feature | Simple Obstruction | Strangulation | |---------|-------------------|----------------| | Pain | Colicky, intermittent | Constant, severe | | Hernia | May be reducible | Tense, irreducible | | Fever | Absent | Present | | Lactate | Normal | Elevated | | Bowel sounds | Hyperactive initially | Absent | | Systemic toxicity | Mild/absent | Marked (shock, sepsis) | **High-Yield:** Elevated serum lactate (>2 mmol/L) is a marker of bowel ischemia and indicates tissue necrosis has begun. This is a surgical emergency. ## Management Algorithm ```mermaid flowchart TD A[Strangulated hernia suspected]:::outcome --> B{Systemic signs present?}:::decision B -->|Yes: fever, lactate, shock| C[Emergency surgical exploration]:::urgent B -->|No: stable, early| D[Consider imaging if diagnosis unclear]:::action C --> E[Resuscitate: IV fluids, NG tube, antibiotics]:::action E --> F[Intraoperative assessment of bowel viability]:::action F --> G{Bowel viable?}:::decision G -->|Yes| H[Reduce hernia, repair]:::action G -->|No| I[Resect necrotic segment, repair]:::action I --> J[High mortality if delayed]:::urgent ``` **Clinical Pearl:** Manual reduction of a strangulated hernia is contraindicated—it may reduce gangrenous bowel into the peritoneal cavity, causing peritonitis and sepsis. The only safe approach is surgical exploration. **Warning:** Do NOT attempt imaging (CT) or observation in a patient with strangulation signs. Every hour of delay increases mortality. This patient needs the OR within 2 hours. **Mnemonic: STRANGULATION URGENCY** — Shock, Tenderness (severe), Redness, Absent bowel sounds, Nausea/vomiting, Gangrene risk, Urgency (surgical) = **Operate immediately**. [cite:Sabiston Textbook of Surgery 21e Ch 43]