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. 1980;13(1):45-8.
doi: 10.1016/s0022-0736(80)80008-2.

Variability of heart rate, P-R, QRS and Q-T durations in twins

R J Havlik, R J Garrison, R Fabsitz, M Feinleib

Variability of heart rate, P-R, QRS and Q-T durations in twins

R J Havlik et al. J Electrocardiol. 1980.

Abstract

During a cardiovascular risk factor study, electrocardiograms were done on 355 sets of middle-aged male monozygotic and dizygotic twins. Potential genetic variability in ventricular rate and P-R, QRS, and Q-T duration was investigated using classical statistical twin methodology. Significant genetically determined variability was found for ventricular rate and P-R interval. These findings suggest that heart rate and, to a lesser extent, atrial depolarization are under genetic control with 54% and 34%, respectively, of the variation among individuals explained by heredity.

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