A 58-year-old man with a known left inguinal hernia presents to the emergency department with acute onset severe left lower abdominal pain for 6 hours, associated with vomiting and absolute constipation. On examination, he is restless, tachycardic (HR 110/min), and has a tender, irreducible, firm left inguinal swelling. His abdomen is distended with visible peristaltic waves. Laboratory investigations show Hb 14.2 g/dL, WBC 16,500/μL, and serum lactate 4.2 mmol/L (normal <2). Plain abdominal X-ray reveals dilated small bowel loops with air-fluid levels. What is the most appropriate next step in management?

Explanation

## Clinical Diagnosis **Key Point:** This patient has an **incarcerated inguinal hernia with strangulation** — evidenced by signs of bowel obstruction (vomiting, constipation, dilated loops on X-ray) plus systemic toxicity (tachycardia, elevated lactate, leukocytosis). ## Why Strangulation Is Suspected | Finding | Significance | |---------|-------------| | Firm, irreducible swelling | Suggests vascular compromise | | Elevated serum lactate (4.2) | Indicates tissue ischemia | | WBC 16,500/μL | Inflammatory response to necrotic bowel | | Restlessness + severe pain | Peritoneal irritation from ischemic bowel | | Absolute constipation + vomiting | Complete mechanical obstruction | **High-Yield:** Strangulation is a surgical emergency. Unlike simple incarceration (which may resolve with conservative care), strangulation carries risk of bowel necrosis, perforation, and sepsis within hours. ## Management Algorithm ```mermaid flowchart TD A[Incarcerated hernia with signs of obstruction]:::outcome --> B{Evidence of strangulation?}:::decision B -->|Yes: lactate ↑, tachycardia, peritonitis| C[Emergency surgical exploration]:::urgent B -->|No: stable, no systemic toxicity| D[Trial of conservative management]:::action C --> E[Resuscitation: NG tube, IV fluids, antibiotics]:::action E --> F[Urgent hernia repair ± bowel resection]:::action D --> G{Resolves in 6-12 hrs?}:::decision G -->|Yes| H[Elective repair in 2-3 weeks]:::action G -->|No| C ``` **Clinical Pearl:** Lactate >2 mmol/L in the setting of acute hernia is a red flag for strangulation. Combined with tachycardia and leukocytosis, it mandates emergency surgery without delay. **Warning:** Attempting manual reduction of a strangulated hernia risks perforating necrotic bowel into the peritoneal cavity, converting a contained problem into diffuse peritonitis and sepsis. ## Correct Management Sequence 1. **Immediate resuscitation:** NG tube (decompress stomach), two large-bore IVs, fluid bolus 2. **Antibiotics:** Broad-spectrum (e.g., ceftriaxone + metronidazole) to cover gram-negatives and anaerobes 3. **Emergency surgical exploration:** Do not delay for imaging; clinical diagnosis is sufficient 4. **Intraoperative assessment:** Evaluate bowel viability; resect if necrotic 5. **Hernia repair:** Primary repair if contamination is minimal; mesh may be used if no perforation [cite:Sabiston Textbook of Surgery 21e Ch 43]