Why the study?
How can left ventricular ejection time measured by finger-tip plethysmography be corrected for heart rate in healthy young Japanese individuals?
How can left ventricular ejection time measured by finger-tip plethysmography be corrected for heart rate in healthy young Japanese individuals?
The study provides a simple formula (ETc = ET + HR - 70) to correct left ventricular ejection time measured by finger-tip plethysmography for heart rate in young Japanese individuals.
May support HR correction of ET in Japanese juveniles; leaves open validation in other populations.
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/square root 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 equals 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.
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Ishikawa et al. (1975) studied this question.
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