A 72-year-old woman with a 10-year history of asymptomatic right femoral hernia presents with acute onset right groin pain, nausea, and constipation for 8 hours. On examination, she is afebrile (37.2°C), heart rate 102/min, blood pressure 128/82 mmHg. The femoral hernia is small (2 cm), tender, firm, and irreducible. Abdominal examination shows mild distension with normal bowel sounds. Laboratory studies show WBC 11,200/μL, lactate 2.1 mmol/L. What is the most appropriate next step?

Explanation

## Clinical Diagnosis **Key Point:** This is a **strangulated femoral hernia** — a high-risk hernia type with narrow neck and poor collateral blood supply. Acute irreducibility with pain mandates emergency surgery regardless of systemic signs. ### Why Femoral Hernias Are High-Risk | Feature | Clinical Significance | |---------|----------------------| | Narrow neck (femoral ring) | High risk of strangulation | | Small defect | Contents easily trapped; difficult to reduce | | Poor collateral circulation | Ischemia develops rapidly | | Omentum or bowel common | Both can strangulate | | Delayed presentation | Often asymptomatic until strangulation | **High-Yield:** Femoral hernias account for only 3–5% of all hernias but have a **40% lifetime risk of strangulation** — the highest of all hernia types. They are more common in women. ### Red Flags for Strangulation in This Case 1. **Acute irreducibility** — hernia was asymptomatic for 10 years, now suddenly irreducible 2. **Severe pain** — indicates ischemia, not just obstruction 3. **Firm, tender hernia** — edema and vascular compromise 4. **Constipation + nausea** — suggests bowel involvement 5. **Elevated lactate (2.1)** — early sign of tissue ischemia (normal <2.0) 6. **Tachycardia** — physiologic response to ischemia **Warning:** Normal or near-normal systemic signs (afebrile, normal BP, only mild leukocytosis) do **NOT** exclude strangulation. Early ischemia occurs before peritonitis develops. Lactate elevation is an early marker. ### Decision Algorithm ```mermaid flowchart TD A[Acute irreducible femoral hernia]:::outcome --> B{Strangulation suspected?}:::decision B -->|Yes: pain + irreducibility + elevated lactate| C[Emergency surgery]:::urgent B -->|No: painless, reducible| D[Elective repair within days]:::action C --> E[Surgical exploration]:::action E --> F{Bowel viability?}:::decision F -->|Viable| G[Hernia repair]:::action F -->|Non-viable| H[Resection + repair]:::action ``` **Clinical Pearl:** Femoral hernias have a **high recurrence rate** (10–15%) with simple suture repair. Mesh repair is preferred. Emergency repair does not preclude mesh use if bowel is viable. ## Correct Answer Justification Emergency surgical exploration is mandatory because: 1. **Strangulation risk is highest** with femoral hernias 2. **Time-dependent ischemia** — bowel viability must be assessed within hours 3. **Lactate elevation** confirms tissue hypoperfusion 4. **Irreducibility + pain** = loss of blood supply until proven otherwise 5. **Taxis is contraindicated** (see Question 1 reasoning) The hernia contents (bowel vs. omentum) are determined intraoperatively; imaging delays treatment. [cite:Sabiston 21e Ch 44; Bailey & Love 27e Ch 36]