In hypertrophic obstructive cardiomyopathy there is a typical postextrasystolic pressure change in the left ventricle and in the aorta. On the beat immediately following a premature ventricular contraction:
An echocardiographic technique to measure the left ventricular ejection time (LVET) in the postextrasystolic beat was shown to be more sensitive. LVET increased by more than 20 msec in eleven of twelve patients with IHSS. (Circulation 1975;52:306-312)
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