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

  title={Variability of heart rate, P-R, QRS and Q-T durations in twins.},
  author={Richard J. Havlik and Robert J. Garrison and Richard R. Fabsitz and Manning Feinleib},
  journal={Journal of electrocardiology},
  volume={13 1},
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… CONTINUE READING

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