What is the common type and size for an arterial cannula in ECMO procedures?

In ECMO procedures, the arterial cannula is crucial for delivering oxygenated blood back to the patient. The common type used is a bullet tip return cannula, which is designed for efficient blood flow while minimizing turbulence and damage to blood cells. The bullet shape helps facilitate smoother insertion and reduces the risk of thrombosis at the cannulation site.

The size of the cannula typically used in these procedures is 21 French (F), which provides a good balance between adequate flow rates and minimizing trauma to the vascular system. A 21 F cannula is large enough to provide sufficient perfusion without being excessively large, which could lead to complications such as vascular injury or increased resistance to blood flow.

Overall, option B accurately reflects the standard practice in ECMO procedures regarding the type and size of arterial cannulas utilized for optimal patient outcomes.