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Related Experiment Videos

Left ventricular ejection fraction during cardiac surgery: a two-dimensional echocardiographic study.

J M Dubroff, M B Clark, C Y Wong

    Circulation
    |July 1, 1983
    PubMed
    Summary

    Surgery for acquired heart disease significantly alters left ventricular ejection fraction immediately after cardiopulmonary bypass. Echocardiography reveals distinct changes in ejection fraction following valvular lesion correction, aiding early clinical decisions.

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    Area of Science:

    • Cardiology
    • Cardiac Surgery
    • Echocardiography

    Background:

    • Long-term effects of cardiac surgery are known, but immediate impacts on left ventricular function remain unclear.
    • Acquired heart disease necessitates surgical intervention, impacting cardiac performance.

    Purpose of the Study:

    • To define the immediate effects of surgery for acquired heart disease on left ventricular function.
    • To assess the feasibility of intraoperative two-dimensional echocardiography for evaluating left ventricular function.

    Main Methods:

    • 44 adult patients with acquired heart disease underwent intraoperative two-dimensional echocardiography.
    • Ejection fraction was measured using short-axis area change and multiple sections before and after cardiopulmonary bypass.
    • Evaluated effects of mitral regurgitation, aortic regurgitation, mitral stenosis, aortic stenosis, and coronary artery bypass grafting.

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    Main Results:

    • Correction of mitral and aortic regurgitation significantly decreased ejection fraction (p<0.02 and p<0.0005).
    • Relief of aortic and mitral stenosis significantly increased ejection fraction (p<0.02 and p<0.05).
    • Ejection fraction remained unchanged after coronary artery bypass grafting; preload decreased only after aortic regurgitation correction.

    Conclusions:

    • Correction of pure mitral and aortic valvular lesions causes characteristic immediate postoperative alterations in ejection fraction.
    • Changes in ejection fraction, except possibly in aortic regurgitation, do not appear to reflect preload changes.
    • Two-dimensional echocardiography is feasible for noninvasive assessment of left ventricular function during cardiac surgery, aiding early postoperative decision-making.