Question

Paracentesis thoracis is usually done in which of the following intercostal space in midaxillary line?

• A. \( 7^{th} \)
• B. \( 8^{th} \)
• C. \( 9^{th} \)
• D. \( 6^{th} \)

Hint:

\textbf{Pulmonology: Thoracentesis Site.} Remember that the 8th intercostal space in the midaxillary line is a standard landmark for thoracentesis. However, the optimal site should always be confirmed by clinical examination and preferably with imaging (like ultrasound) to assess the fluid level and avoid complications.

Answer 1

The Correct Option is B

Thoracentesis, or pleural tap, is a procedure to remove fluid or air from the pleural space surrounding the lungs. The typical site for diagnostic and therapeutic thoracentesis in the midaxillary line is the 8th intercostal space. The choice of intercostal space is crucial to avoid injury to underlying structures such as the diaphragm (which rises higher than this level) and abdominal organs. The midaxillary line is a common approach because it provides a safe window to access the pleural space, especially when fluid is present, which tends to gravitate to the lower parts of the pleural cavity. Ultrasound guidance is often used to precisely locate the fluid and guide the needle insertion, further enhancing safety and accuracy.