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Do coronary artery bypass operations prolong life?

K W Carr, R L Engler, J Ross

    The Western Journal of Medicine
    |April 1, 1982
    PubMed
    Summary

    Coronary artery bypass surgery improves survival for some patients with coronary artery disease, particularly those with left ventricular dysfunction. For most patients, limiting angina symptoms is the primary reason for surgery due to small survival differences.

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    Area of Science:

    • Cardiovascular Surgery
    • Interventional Cardiology
    • Clinical Trials

    Background:

    • The survival benefit of coronary artery bypass operations for patients with coronary artery disease has been debated, especially in those without left main stenosis.
    • Previous studies lacked sufficient control for patient risk factors and cohort heterogeneity.

    Purpose of the Study:

    • To evaluate the long-term survival benefits of coronary artery bypass surgery compared to medical management in various patient subgroups.
    • To clarify the role of coronary artery bypass surgery in patients with different severities of coronary artery disease and left ventricular function.

    Main Methods:

    • Analysis of data from large-scale clinical studies, including randomized trials like the Veterans Administration Cooperative Study, European Coronary Surgery Study Group, and Coronary Artery Surgery Study (CASS).
    • Subgroup analysis based on the number of diseased coronary arteries and the degree of left ventricular dysfunction.

    Main Results:

    • Coronary artery bypass surgery prolonged survival only in high-risk subgroups, specifically those with symptomatic left main coronary artery stenosis and those with double- and triple-vessel disease and left ventricular dysfunction.
    • Survival with single-vessel disease is excellent with medical management and not improved by surgery.
    • Medically treated patients with double- and triple-vessel disease and good left ventricular function generally have >85% five-year survival, with limited evidence of improvement from surgery.

    Conclusions:

    • Coronary artery bypass surgery offers survival benefits primarily for symptomatic patients with left main coronary artery stenosis and those with double- or triple-vessel disease coupled with left ventricular dysfunction.
    • For patients with less severe disease or good left ventricular function, the survival benefits of surgery are minimal, making symptom management the primary indication.
    • Ongoing improvements in surgical techniques may influence future survival differences, but current evidence suggests limiting angina is key for individual patient decisions.

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