A 58-year-old man with a 10-year history of an untreated right inguinal hernia presents to the emergency department with acute onset of severe right lower abdominal pain, vomiting, and abdominal distension for the past 6 hours. On examination, he is febrile (38.5°C), tachycardic (110 bpm), and has a tender, irreducible right inguinal mass. His abdomen is distended with visible peristaltic waves. Laboratory investigations show WBC 14,500/μL, hemoglobin 16 g/dL (elevated), and lactate 4.2 mmol/L. Abdominal X-ray reveals multiple air-fluid levels with a transition point at the right groin. What is the most appropriate next step in management?

Explanation

## Clinical Diagnosis: Strangulated Inguinal Hernia with Bowel Obstruction ### Key Clinical Features **Key Point:** The combination of irreducibility, acute severe pain, fever, elevated lactate, and imaging evidence of small bowel obstruction with a transition point at the groin indicates **strangulation** — not simple obstruction. ### Why Strangulation, Not Simple Obstruction? | Feature | Simple Obstruction | Strangulation | | --- | --- | --- | | Pain character | Intermittent, colicky | Constant, severe | | Fever | Absent | Present (38.5°C here) | | Tachycardia | Mild | Marked (110 bpm) | | Lactate | Normal | Elevated (4.2 mmol/L) | | Hemoglobin | Normal | Elevated (hemoconcentration) | | Irreducibility | Variable | Always | | Time-sensitive | No | **YES — tissue necrosis begins at 6–8 hours** | **High-Yield:** Elevated lactate indicates **intestinal ischemia and bacterial translocation** — this is the biochemical marker of strangulation. ### Why Immediate Surgery Is Mandatory 1. **Strangulation is a surgical emergency.** Every hour of delay increases mortality and morbidity (perforation, sepsis, multi-organ failure). 2. **Lactate >2 mmol/L + fever + irreducible mass** = tissue necrosis is already occurring. 3. **Manual reduction is contraindicated** — you risk reducing necrotic bowel back into the abdomen, causing peritonitis and sepsis. 4. **Preoperative imaging delays definitive treatment** when the diagnosis is clinically clear. ### Operative Goals - Reduce the hernia contents under direct visualization - Assess bowel viability (color, bleeding, peristalsis) - Resect any necrotic segment - Perform primary hernia repair (tension-free mesh or open primary repair depending on contamination) **Clinical Pearl:** The "transition point" on X-ray at the groin is pathognomonic for hernia-related obstruction and confirms the site of strangulation. **Mnemonic: STRANGULATION SIGNS — SALT** - **S**evere, constant pain - **A**cute onset - **L**actate elevated - **T**emperature fever [cite:Sabiston Textbook of Surgery 21e Ch 44]