doppler cardiac output determinations were measured from four sites ( suprasternal long axis of the ascending aorta , suprasternal long axis of the descending aortic , apical left ventricular outflow tract , and parasternal long axis of the main pulmonary artery ) and were compared to cardiac output determined by thermodilution for a total of 101 observations ( r = 0.84 ) .
C0003956
ascending aorta
C0003483
aortic