Retrograde cardioplegia delivery

Intraoperative TEE 4-chamber cross-sectional image displaying the RA, RV, LV, and CS (panel A). The CS is a posterior structure along the atrioventricular groove with an opening in the RA. Retrograde cardioplegia is delivered through a cuffed cannula inserted from the surgical field into the RA and positioned with cuff (labeled B) within the opening of the CS (panel B).