A 32-year-old man is brought to the emergency department with a gunshot wound to the left chest wall. On examination, he is conscious, blood pressure 110/70 mmHg, respiratory rate 28/min, and there is a single entry wound with no exit wound. Chest X-ray shows a bullet lodged in the left hemithorax with no pneumothorax or hemothorax. What is the most appropriate next step in management?

Explanation

## Assessment of Retained Bullet in Stable Firearm Injury ### Clinical Context The patient is hemodynamically stable with normal vital signs (except mild tachypnea), no signs of tension pneumothorax, and no radiographic evidence of pneumothorax or hemothorax on initial chest X-ray. ### Why CT Chest with Contrast is Correct **High-Yield:** In a stable patient with a retained bullet, CT imaging is essential to: - Determine the exact trajectory and location of the projectile - Assess for injuries to vital structures (heart, great vessels, lungs, esophagus) - Identify occult hemothorax, pneumothorax, or cardiac tamponade - Guide surgical planning if intervention becomes necessary **Key Point:** Retained bullets themselves are NOT automatically an indication for removal if the patient is stable and no major organ injury is evident. Indications for removal include: infection risk (abdominal/pelvic bullets near bowel), lead toxicity (rare), or if the bullet is accessible and removal is low-risk. **Clinical Pearl:** A single entry wound with no exit wound and no immediate radiographic findings does NOT rule out serious internal injury. The trajectory may involve mediastinal structures, cardiac chambers, or major vessels that are not yet decompensated. ### Management Algorithm ```mermaid flowchart TD A[Gunshot wound to chest]:::outcome --> B{Hemodynamically stable?}:::decision B -->|No| C[Immediate surgical exploration]:::urgent B -->|Yes| D[CT chest with IV contrast]:::action D --> E{Major vessel/cardiac injury?}:::decision E -->|Yes| F[Urgent surgical exploration]:::urgent E -->|No| G{Pneumothorax/hemothorax?}:::decision G -->|Yes| H[Chest tube + observation]:::action G -->|No| I[Observation with serial exams]:::action ``` ### Why Observation Alone is Insufficient While serial clinical examination is part of management, it cannot detect occult mediastinal or cardiac injury. Imaging must precede observation. ### Why Immediate Surgery is Premature The patient is stable with no signs of tension physiology or massive hemorrhage. Blind surgical exploration in a stable patient increases morbidity without clear benefit.