Total left ventricular external power and aortic input impedance spectra were calculated from recordings of pulsatile pressure and flow in the ascending aorta of 22 human subjects undergoing cardiac catheterization. Eleven subjects had increased aortic pressure (systolic 153 +/- 3.8[SEM] mm Hg, p less than .001; diastolic 91 +/- 2.4 mm Hg, p less than .03; mean 118 +/- 2.4 mm Hg, p less than .0...
