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Related Experiment Videos

Changes in left ventricular function during exercise and their relation to ST segment changes in patients with

M J O'Hara, R I Jones, A Lahiri

    British Heart Journal
    |February 1, 1986
    PubMed
    Summary

    A nuclear probe can continuously measure left ventricular ejection fraction during exercise. In patients with exertional angina, ejection fraction fell before ECG changes, unlike healthy controls where it increased.

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    Area of Science:

    • Cardiology
    • Nuclear Medicine
    • Exercise Physiology

    Background:

    • Assessing left ventricular ejection fraction (LVEF) during interventions is crucial.
    • Non-imaging nuclear probes offer high count sensitivity for continuous LVEF monitoring.
    • Understanding LVEF changes during exercise in stable exertional angina is important.

    Purpose of the Study:

    • To evaluate LVEF changes during dynamic exercise in patients with stable exertional angina.
    • To determine the temporal relationship between LVEF changes and ST segment depression.
    • To compare the LVEF response to exercise in patients versus healthy controls.

    Main Methods:

    • Utilized a non-imaging nuclear probe with technetium-99m for in vivo blood pool labeling.
    • Continuously recorded left ventricular time-activity waveforms.

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  • Measured LVEF and ST segment depression at rest, during maximal ergometric exercise, and recovery.

    • Main Results:

    • In angina patients, mean LVEF fell by 16.8% during exercise, driven by increased end-diastolic and end-systolic volumes.
    • In healthy controls, mean LVEF increased by 10.2% during exercise.
    • A significant decrease in LVEF occurred within 1 minute of exercise onset in most patients, preceding ST depression.

    Conclusions:

    • Continuous LVEF monitoring via nuclear probe is feasible during short-term interventions.
    • LVEF declines precede ischemic ECG changes in patients with stable exertional angina.
    • Exercise elicits distinct LVEF responses in patients with exertional angina compared to healthy individuals.