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Related Experiment Videos

Left ventricular volume during maximal supine exercise: a study using metallic epicardial markers.

J H Caldwell, D K Stewart, H T Dodge

    Circulation
    |October 1, 1978
    PubMed
    Summary

    Epicardial markers accurately measure left ventricular (LV) volumes and ejection fraction during exercise. Changes in these parameters indicate myocardial damage or incomplete revascularization after surgery.

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    Area of Science:

    • Cardiology
    • Biomedical Engineering
    • Physiology

    Background:

    • Assessing left ventricular (LV) function during exercise is crucial for evaluating coronary artery disease.
    • Traditional methods for measuring LV volumes and ejection fraction during exercise can be invasive or limited.
    • Epicardial markers offer a potential non-invasive solution for dynamic LV assessment.

    Purpose of the Study:

    • To evaluate changes in left ventricular (LV) volumes and ejection fraction from rest to maximal supine exercise using epicardial markers.
    • To determine if resting LV function predicts exercise response and revascularization success.
    • To correlate epicardial marker-derived LV performance with graft patency and myocardial status.

    Main Methods:

    • 11 patients with coronary artery surgery had 4 epicardial markers placed.

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  • Marker distances were calibrated to LV volume (r=0.92-0.99) per cardiac cycle.
  • Regression equations computed LV volumes and ejection fraction at rest and during maximal supine exercise.

    • Main Results:

    • Epicardial marker calibration accurately determined LV volumes and ejection fraction.
    • Resting LV volumes and ejection fraction did not predict exercise response or revascularization extent.
    • Patients with unchanged/increased ejection fraction during exercise had higher graft patency (86% vs 50%).
    • Decreased ejection fraction or increased volumes during exercise indicated myocardial damage or incomplete revascularization.

    Conclusions:

    • Epicardial marker motion is a viable method for assessing LV volumes and ejection fraction during maximal supine exercise.
    • The response of the revascularized left ventricle to exercise (decreased volumes, increased ejection fraction) reflects preserved function.
    • Abnormal LV responses during exercise suggest myocardial infarction, fibrosis, or incomplete revascularization.