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Related Experiment Videos

Electrocardiography: the electrical axis.

D J Rowlands

    British Journal of Hospital Medicine
    |May 1, 1978
    PubMed
    Summary
    This summary is machine-generated.

    The electrical axis of the heart, representing the mean QRS vector, is determined by frontal-plane leads. Deviations from normal axis can indicate various cardiac disease states.

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    Area of Science:

    • Cardiology
    • Electrocardiography
    • Cardiac Electrophysiology

    Background:

    • The electrical axis of the heart is conventionally defined as the mean frontal-plane axis of the QRS complex.
    • This axis represents the overall direction of ventricular depolarization.
    • It is determined by the angle between the mean QRS vector and lead I.

    Purpose of the Study:

    • To define the electrical axis of the heart and its measurement.
    • To discuss factors influencing the electrical axis, such as age and body build.
    • To highlight the significance of axis deviation in diagnosing cardiac diseases.

    Main Methods:

    • Determination of the mean frontal-plane axis of the QRS complex.
    • Measurement of the angle between the mean QRS vector and lead I.

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  • Visual inspection of frontal-plane electrocardiogram leads.

    • Main Results:

    • The electrical axis can be determined to the nearest 15 degrees by simple inspection.
    • The electrical axis is influenced by patient age and body build.
    • Significant deviations from normal axis are observed in various disease states.
    • Common causes of abnormal left axis deviation (LAD) and right axis deviation (RAD) exist.

    Conclusions:

    • The electrical axis of the heart is a fundamental electrocardiographic parameter.
    • Axis deviation is a valuable indicator of underlying cardiac pathology.
    • Understanding normal and abnormal electrical axis is crucial for clinical diagnosis.