Which gauge needle is generally used in the PTC procedure?

In the percutaneous transhepatic cholangiography (PTC) procedure, the most commonly used gauge needle is typically 21 or 22 gauge. This size is chosen because it strikes a balance between being adequately sized for fluid aspiration and allowing for the introduction of contrast media while minimizing tissue trauma.

A needle of 21 or 22 gauge is also sufficiently robust to access the biliary system through the liver, where precision is essential. This gauge provides enough strength to help navigate through the liver tissue effectively while being thin enough to reduce the risk of complications, such as bleeding or damage to surrounding structures.

In comparison, using gauges that are too small could lead to issues with aspiration and contrast injection, while larger gauges could increase the risk of procedural complications and discomfort for the patient. Hence, the choice of a 21 or 22 gauge needle is optimal for ensuring patient safety and procedural efficacy during a PTC procedure.