What is the typical size of a venous cannula used in ECMO insertion?

The typical size of a venous cannula used in ECMO insertion is commonly around 25 French (F). This size provides an adequate lumen to allow for sufficient blood flow during ECMO support, which is crucial for effective gas exchange and maintaining hemodynamic stability. The larger diameter of the cannula ensures that a significant volume of blood can be drawn from the patient's venous system, facilitating optimal oxygenation and removal of carbon dioxide during the ECMO process.

When selecting the size of the cannula, considerations include the patient's size, vascular anatomy, and the specific clinical scenario being addressed. A 25 F cannula strikes a balance between maximizing flow rates and minimizing complications associated with larger cannulas, such as increased risk of vascular injury or thrombosis. Venous cannulas in ECMO support are designed to accommodate the high flow rates required for adequate systemic circulation, which is particularly important in critically ill patients undergoing this form of mechanical support.