Where is a common site for venous cannulation in the heart?

The right auricle is indeed a common site for venous cannulation in certain cardiac procedures, particularly during cardiopulmonary bypass or in specific surgical interventions. The right auricle is an extension of the right atrium and serves as a reservoir for blood returning from the systemic circulation via the superior and inferior vena cavae.

Cannulating the right auricle allows for effective drainage of venous blood because it directly connects to the right atrium. This site is also advantageous in terms of anatomical access, as it is relatively superficial compared to deeper structures, making it easier and safer to cannulate.

In contrast, while the right atrium and coronary sinus are also locations where cannulation might occur, the specifics of vascular access and the typical techniques used in procedures often favor the right auricle due to its accessibility and the volume of blood it can accommodate. Cannulating the left atrium is less common for venous access since it primarily receives oxygenated blood from the pulmonary veins rather than acting as a venous reservoir. Thus, the context of the procedure and the anatomy involved come together to make the right auricle a preferred site for venous cannulation.