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Left ventricular function during atrial pacing: a radionuclide angiographic study.

Y Rozenman, A T Weiss, H Atlan

    Clinical Cardiology
    |June 1, 1984
    PubMed
    Summary
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    Atrial pacing in normal subjects decreased ventricular volumes with increased heart rate. Cardiac output and ejection fraction remained stable, indicating normal cardiac response to tachycardia.

    Area of Science:

    • Cardiology
    • Nuclear Medicine
    • Physiology

    Background:

    • Assessing left ventricular function is crucial for understanding cardiac health.
    • Radionuclide angiography is a valuable tool for non-invasive cardiac imaging.

    Purpose of the Study:

    • To investigate the effects of increased heart rate on left ventricular volumes and function in normal subjects.
    • To determine the normal cardiac response to pharmacologically or physiologically induced tachycardia.

    Main Methods:

    • Multigated radionuclide angiography (MUGA) was performed at rest and during atrial pacing.
    • Left ventricular volumes (end-diastolic and end-systolic) were measured using total counts in the region of interest.
    • Calculations included stroke volume, cardiac output, ejection fraction, and ejection fraction rate at varying heart rates.

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    Main Results:

    • Increased heart rate led to a decrease in end-diastolic, end-systolic, and stroke volumes.
    • Cardiac output and ejection fraction showed no significant change with increased heart rate.
    • Ejection fraction rate increased, while the uncorrected ejection rate decreased as heart rate rose.

    Conclusions:

    • Normal subjects exhibit a decrease in ventricular volumes during tachycardia induced by atrial pacing.
    • Left ventricular ejection fraction and cardiac output are maintained during induced tachycardia in healthy individuals.
    • These findings characterize the typical hemodynamic adjustments of the healthy heart to increased heart rate.