Advanced Trauma Life Support (ATLS) POST Practice Test 2026 - Free ATLS Practice Questions and Study Guide

In cases of suspected tension pneumothorax, the immediate step is to perform needle decompression. Tension pneumothorax occurs when air enters the pleural space and cannot escape, leading to increased pressure that collapses the lung on the affected side and can compress major blood vessels, resulting in compromised circulation and respiratory function.

Needle decompression is a critical life-saving procedure that rapidly relieves the pressure in the pleural cavity, allowing the collapsed lung to re-expand and improving hemodynamic stability. This procedure is typically performed in the second intercostal space at the midclavicular line on the affected side or, in some cases, in the fifth intercostal space at the anterior axillary line, depending on the physician's preference and clinical protocol.

This action is time-sensitive, and delaying it can lead to severe complications, including cardiovascular collapse and respiratory failure. Thus, performing needle decompression is the most immediate and effective response to tension pneumothorax.