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A simplified method of electrocardiogram interpretation.

R W Morris

    South African Medical Journal = Suid-Afrikaanse Tydskrif Vir Geneeskunde
    |November 13, 1976
    PubMed
    Summary
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    A modified step test and electrocardiogram (ECG) analysis can effectively identify myocardial ischemia. Measuring the S-T segment slope in lead V6 six minutes post-exercise reliably distinguishes abnormal subjects from normal ones.

    Area of Science:

    • Cardiology
    • Exercise Physiology

    Background:

    • Electrocardiograms (ECGs) are crucial for diagnosing cardiac conditions.
    • Standard exercise tests can be resource-intensive for office settings.

    Purpose of the Study:

    • To introduce a modified step test for office-based electrocardiogram (ECG) performance.
    • To evaluate the diagnostic capability of post-exercise ECGs for identifying myocardial ischemia.

    Main Methods:

    • A modified step test was employed for office-based exercise electrocardiogram (ECG) performance.
    • 104 ECGs were analyzed, focusing on hemodynamic changes and S-T segment slope in lead V6, six minutes post-effort.
    • Statistical analysis involved tabulating and graphing ECG measurements.

    Main Results:

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    • Measuring the S-T segment slope in lead V6, six minutes after exercise, distinguished abnormal subjects from normal subjects with over 95% accuracy.
    • A plane segment combined with an S-T slope angle under 6.5 degrees completely separated normal subjects from those with myocardial ischemia.
    • Findings generally correlated with patient medical histories.

    Conclusions:

    • The modified step test combined with specific ECG analysis is a highly effective method for diagnosing myocardial ischemia in an office setting.
    • This approach offers a reliable and accessible tool for differentiating between normal and ischemic cardiac responses to exercise.