cannulation

Cannulation is a medical procedure involving the insertion of a cannula—a thin, flexible tube—into a blood vessel or other body cavity. While often associated with intravenous (IV) access for delivering fluids and medications, cannulation has a broader range of applications in modern medicine.

The most common type is peripheral venous cannulation, where a small-gauge cannula is inserted into a vein in the arm or hand. This allows healthcare professionals to administer medication directly into the bloodstream, provide hydration, or, when appropriate, take blood samples through the line. However, cannulation isn't limited to peripheral veins. Central venous cannulation involves inserting a catheter into larger veins near the heart (like the jugular, subclavian, or femoral veins) and is used for long-term access, administering medications that irritate smaller veins, or monitoring central venous pressure. In operating rooms and intensive care units, larger cannulas may be used for cardiopulmonary bypass or extracorporeal membrane oxygenation (ECMO).

Beyond vascular access, cannulation also applies to other procedures like arterial cannulation—inserting a cannula into an artery to continuously monitor blood pressure during critical care—and even the drainage of fluid collections (like pleural effusions) using specialized catheters inserted via cannulation techniques.

The procedure requires sterile technique, anatomical knowledge, and careful attention to detail to minimize complications such as infection, bleeding, or nerve damage. While seemingly simple, successful cannulation is a cornerstone of many medical treatments and diagnostic procedures, playing a vital role in patient care across various specialties—from emergency medicine to oncology.