A thoracentesis is performed by inserting a large bore needle into the pleural space between the:

A thoracentesis is a medical procedure performed to remove fluid or air from the pleural space for diagnostic or therapeutic reasons. The correct location for inserting the needle during a thoracentesis is critical for minimizing complications and avoiding injury to surrounding structures.

In this procedure, the typical insertion site is located between the 7th and 8th ribs. This area is chosen because it is usually above the level of the diaphragm, which allows access to the pleural space while avoiding the risk of injury to vital structures, such as the lungs and major blood vessels. The intercostal space between these ribs provides adequate space for the needle insertion and minimizes the risk of penetrating blood vessels and nerves that are situated in the potentially higher intercostal spaces.

Understanding the anatomy is crucial, and the 7th and 8th ribs are considered the safest and most effective access points for thoracentesis, aligning with standard guidelines and clinical practices. This choice ensures that the procedure is conducted in a manner that maximizes patient safety and procedural effectiveness.