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Related Experiment Videos

Electrocardiographic axis deviation in Navajo and Apache indians.

G A Ewy, R D Okada, F I Marcus

    Chest
    |January 1, 1979
    PubMed
    Summary

    Healthy Navajo and Apache schoolchildren show a higher incidence of electrocardiographic mean frontal-plane QRS axis deviation compared to controls. This finding suggests unique cardiac electrical patterns in these populations.

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    Area of Science:

    • Cardiology
    • Human Physiology
    • Indigenous Health

    Background:

    • Clinical observations suggested wider QRS axis ranges in Navajo and Apache children.
    • Standard electrocardiographic (ECG) parameters may differ across diverse populations.

    Purpose of the Study:

    • To investigate the prevalence of mean frontal-plane QRS axis deviation in healthy Navajo and Apache schoolchildren.
    • To compare ECG findings between Indigenous children and a non-Indigenous control group.

    Main Methods:

    • Electrocardiograms were performed on 146 Navajo, 144 Apache, and 159 control schoolchildren.
    • Participants had normal cardiovascular examinations.
    • Mean frontal-plane QRS axis was analyzed for deviations.

    Main Results:

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    • 19% of Navajo and 12% of Apache children exhibited leftward axis deviation (-1 to -90 degrees).
    • 18% of Navajo and 19% of Apache children showed rightward axis deviation (+91 to +180 degrees).
    • Control group showed significantly lower rates of axis deviation (2% and 5% respectively).

    Conclusions:

    • Healthy Navajo and Apache schoolchildren demonstrate a high incidence of QRS axis deviation.
    • These findings highlight potential population-specific variations in cardiac electrical activity.
    • Further research into the underlying causes of these ECG variations is warranted.