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Related Experiment Videos

Atrioventricular conduction time--a heritable trait?

P Møller, A Heiberg

    Clinical Genetics
    |December 1, 1980
    PubMed
    Summary
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    The P-R interval, a measure of atrioventricular conduction time, is reliably determined from routine electrocardiograms (ECGs) in Norwegian adults. This study confirms its consistency across sexes and minimal influence from factors like age or body size.

    Area of Science:

    • Cardiology
    • Physiology

    Background:

    • The P-R interval on an electrocardiogram (ECG) reflects atrioventricular conduction time.
    • Understanding normal P-R interval ranges and influencing factors is crucial for accurate cardiac assessment.

    Purpose of the Study:

    • To determine the normal range of the P-R interval in a Norwegian population.
    • To assess the reliability and repeatability of P-R interval measurements from routine ECGs.
    • To investigate the influence of demographic and physiological factors on the P-R interval.

    Main Methods:

    • Electrocardiograms (ECGs) were collected from 727 Norwegian adults (491 males, 236 females).
    • Two independent physicians measured the P-R interval on coded ECGs.
    • Statistical analysis determined mean values, standard deviations, and repeatability.

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    Main Results:

    • Mean P-R interval was 0.16 ± 0.04 s for males and 0.15 ± 0.04 s for females.
    • High intra-individual repeatability was observed over a 1-year period with minimal measurement error.
    • Body size, age, heart rate, and non-cardiac conditions showed little impact on the P-R interval within each sex.

    Conclusions:

    • The P-R interval can be reliably measured from routine ECG tracings by trained observers.
    • The findings establish reference values for the P-R interval in this population.
    • Routine ECGs provide a dependable method for assessing atrioventricular conduction time.