the following measurements and calculations were performed both under control conditions and during either angiotensin infusion in 5 normal subjects or nitroprusside infusion in 6 hypertensive patients : cardiac output , aortic blood pressure ( catheter tip micromanometer ) , blood flow velocity ( electromagnetic catheter-tip velocity transducer ) in the ascending aorta , aortic impedance and reflection coefficients allowing the calculation of the aortic forward and backward pressure waves .
C0003956
ascending aorta
C0003483
aortic