The cannulas used to place the patient on cardiopulmonary bypass are shown here. The longer cannula in the forefront (with inner tube) is the venous cannula which is placed in the right atrium to bring the deoxygenated blood to the cardiopulmonary bypass machine. The cannula in the back is the arterial cannula which is introduced into the aorta and functions to return oxygen-rich blood from the cardiopulmonary bypass machine to the patient.
The pericardium has been opened exposing the heart. To the left (toward patient's head), the ascending aorta is visible. The right atrial appendage (purplish) is also visible. Most of the exposed heart surface is comprised of the right ventricle (yellowish fat).
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