What is the most common size of the Avalon cannula used in ECMO?

The Avalon cannula, specifically designed for veno-venous ECMO procedures, is most commonly used at the 31 French (F) size. This size strikes an effective balance between adequate blood flow and minimizing trauma to the vascular system. The 31 F cannula is particularly well-suited for adult patients, allowing for optimal flow rates, which is critical for the successful delivery of oxygenation and support needed in ECMO therapy.

Utilizing a 31 F cannula ensures that the device can accommodate the necessary hemodynamic parameters while maintaining a lower risk of complications such as vessel injury or hemolysis. Given its design and intended use, the 31 F option is thus preferred in clinical practice.