Systolic time intervals utilizing ear densitography. Advantages and reliability for stress testing.
Systolic time intervals were determined in 10 volunteer subjects at rest and during a variety of cardiocirculatory stresses to further evaluate the ear densitogram derivative as a replacement for the carotid pulse curve. There was close tracking of the two methods not only for left ventricular ejection time (r = +0.98), but also for pre-ejection period (r = +0.98). The results confirmed that this technically simple and remarkably stable wave form permits reliable measurement of the systolic time intervals both at rest and during the actual performance of stress.
D000328:Adult; D000818:Animals; D005069:Evaluation Studies as Topic; D005080:Exercise Test / Q000379:methods; D006334:Heart Function Tests / Q000379:methods*; D006801:Humans; D008297:Male; D011187:Posture