Which location is NOT recommended for needle decompression in a suspected tension pneumothorax?

• A. Second intercostal space, midclavicular line
• B. Fourth intercostal space, anterior axillary line
• C. First intercostal space, midline
• D. Between the scapulae

Answer: (D)

When a tension pneumothorax is suspected, the goal is to relieve the intrapleural pressure as quickly as possible by inserting a large-bore needle into the pleural space at a site that is readily accessible and safe. The most reliable anterior sites are the second intercostal space at the midclavicular line or the fourth/fifth intercostal space at the anterior axillary line. These locations provide a direct path to the apex of the pleural space with landmarks that are easier to identify in an emergent, often semi-reclined patient, and they minimize the chance of hitting major structures.

The location behind the shoulder blades is not recommended because the posterior chest is obscured by the scapula and thick back muscles, making access difficult and unreliable. The scapula can block entry, and you’re likely to miss the pleural space or cause injury, especially in a time-critical situation where rapid decompression is essential.