A 28-year-old woman is brought to the emergency department after a fall from a 4-meter height. On primary survey, she responds to verbal stimuli, has a patent airway, and bilateral breath sounds. Vital signs: BP 95/62 mmHg, HR 118/min, RR 28/min, SpO₂ 94% on room air. Glasgow Coma Scale is 13. During secondary survey, you note crepitus over the left chest wall, diminished breath sounds on the left, and tracheal deviation to the right. Neck veins are distended. What is the most likely diagnosis, and what is the immediate management?

Explanation

## Clinical Diagnosis: Tension Pneumothorax ### Classic Triad of Findings | Finding | Mechanism | Significance | |---------|-----------|-------------| | **Tracheal deviation** (to right) | Mediastinal shift from collapsed left lung | Pathognomonic for tension physiology | | **Distended neck veins (JVD)** | Increased intrathoracic pressure impeding venous return | Indicates hemodynamic compromise | | **Diminished breath sounds** (left) + crepitus | Air in pleural space and subcutaneous tissues | Confirms pneumothorax | | **Hypotension + tachycardia** | Reduced venous return, decreased cardiac output | Shock from tension physiology | ## Pathophysiology ```mermaid flowchart TD A[Blunt chest trauma]:::outcome --> B[Visceral pleural tear]:::outcome B --> C[Air enters pleural space]:::outcome C --> D{One-way valve effect?}:::decision D -->|No| E[Simple pneumothorax]:::outcome D -->|Yes| F[Air accumulates with each breath]:::outcome F --> G[Increased intrapleural pressure]:::outcome G --> H[Mediastinal shift + tracheal deviation]:::outcome H --> I[Impaired venous return]:::outcome I --> J[Hypotension, JVD, shock]:::urgent J --> K[TENSION PNEUMOTHORAX]:::urgent ``` ## Key Point: **Tension pneumothorax is a clinical diagnosis made at the bedside during the primary survey. Do NOT wait for chest X-ray confirmation.** The presence of hemodynamic instability (hypotension, tachycardia), JVD, and tracheal deviation in a trauma patient with pneumothorax indicates tension physiology and requires immediate needle decompression. ## High-Yield: - **Needle decompression** is the immediate life-saving intervention: 14-gauge needle at the 2nd intercostal space, midclavicular line on the affected side - This converts tension pneumothorax → simple pneumothorax and restores venous return - **Tube thoracostomy** (chest tube) follows immediately after needle decompression to prevent re-accumulation - Crepitus indicates subcutaneous emphysema, a sign of ongoing air leak (supports pneumothorax diagnosis) ## Clinical Pearl: In a hypotensive trauma patient with clinical signs of tension pneumothorax, needle decompression should be performed *before* imaging. Waiting for a chest X-ray in an unstable patient is a common fatal error. The procedure takes seconds and is immediately reversible if diagnosis is wrong. ## Mnemonic: **JVD + Tracheal deviation + Hypotension + Absent breath sounds = TENSION PNEUMOTHORAX → Needle decompression NOW** [cite:ATLS 10th Edition, Chapter 4: Thoracic Trauma; American College of Surgeons Committee on Trauma]