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

Richard J. Havlik, Robert J. Garrison, Richard Fabsitz, Manning Feinleib

Research output: Contribution to journalArticlepeer-review


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.

Original languageEnglish (US)
Pages (from-to)45-48
Number of pages4
JournalJournal of Electrocardiology
Issue number1
StatePublished - 1980
Externally publishedYes

ASJC Scopus subject areas

  • Cardiology and Cardiovascular Medicine

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