control and one hour post nifedipine m-mode and two-dimensional echocardiograms were performed and the following lv parameters were measured : end-diastolic dimension , systolic shortening , isovolumic relaxation time ( ivrt , time from aortic component of the second heart sound to mitral valve opening ; msec ) , maximal fiber lengthening velocity ( -vcf ; circ/sec ) , and the percent diameter increase during the rapid filling phase ( % drf ; % ) .
C0225897
lv
C0026264
mitral valve