after induction of ischemia by aortic cross-clamping and infusion of cardioplegic solution , six different microspheres 7 to 10 microns in diameter were injected into the aorta at six different times to measure myocardial blood flow during the following interventions : vent drainage of the right or left ventricle or both , proximal ligation of both coronary arteries , severance of the proximal pulmonary artery or the ascending aorta or both , and ligation of the bronchial arteries .
C0003483
aorta
C0003956
ascending aorta