LEFT VENTRICULAR EJECTION TIME MEASURED BY FINGER-TIP PLETHYSMOGRAPHY IN HEALTHY YOUNG JAPANESE ITS CORRECTION FOR HEART RATE

抄録

Finger-tip plethysmograms were recorded photoelectrically on 200 young males and females each. The relation between the left ventricular ejection time (ET) and the preceding heart rate (HR) and a method for correcting ET for the heart rate were studied. The values calculated by the formula ET/√S-S or ET/<S-S> varied with the HR, so these formulae cannot be used for correcting the ET for HR. Thus from the relationship between ET and HR, a formula for converting the measured ET to the ET at an HR of 70, i.e. ETc, was deduced. ETc = ET + HR-70 This formula can be used for both sexes of Japanese juveniles and the values obtained by it can be directly compared, irrespective of the HR.