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Related Experiment Videos

Quantitative two dimensional echocardiography during bicycle exercise in normal subjects

W Zwehl, P Gueret, S Meerbaum

    The American Journal of Cardiology
    |April 1, 1981
    PubMed
    Summary

    Two dimensional echocardiography during supine bicycle exercise accurately measures left ventricular function. This quantitative method shows reduced end-systolic volume and increased ejection fraction during exercise in normal subjects.

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    Area of Science:

    • Cardiology
    • Medical Imaging
    • Physiology

    Background:

    • Assessing left ventricular (LV) function during exercise is crucial for cardiovascular health.
    • Two dimensional echocardiography (2DE) offers a non-invasive method for cardiac evaluation.

    Purpose of the Study:

    • To quantitatively assess left ventricular (LV) function during supine bicycle exercise using two dimensional echocardiography (2DE).
    • To evaluate the reproducibility of 2DE measurements for LV sectional and global function during exercise.

    Main Methods:

    • A quantitative two dimensional echocardiographic (2DE) study was performed on 10 healthy subjects during supine bicycle exercise.
    • Standardized short axis and apical views were analyzed to derive LV areas and length.
    • LV volumes and ejection fraction were calculated using a simplified formula.

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    Main Results:

    • Satisfactory 2DE views and measurements were obtained across a range of exercise heart rates (108-152 bpm).
    • LV end-systolic volume significantly decreased (28.1 to 20.8 cc/m2, p<0.001).
    • LV ejection fraction significantly increased (63.4% to 72.1%, p<0.001) with exercise.

    Conclusions:

    • Standardized 2DE during supine bicycle exercise provides reproducible measurements of LV function.
    • This quantitative 2DE exercise protocol is feasible for assessing both global and segmental LV performance in patients.