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Glucose substrate in myocardial protection

T A Salerno, S M Wasan, E J Charrette

    The Journal of Thoracic and Cardiovascular Surgery
    |January 1, 1980
    PubMed
    Summary

    Glucose-insulin-potassium (GIK) infusion improved myocardial glycogen levels during cardiac surgery. While clinical outcomes were similar, glucose preserved heart muscle glycogen during cardioplegic arrest, suggesting a protective benefit.

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    Area of Science:

    • Cardiology
    • Cardiac Surgery
    • Metabolic Research

    Background:

    • Myocardial protection during cardiac surgery is critical.
    • Maintaining myocardial glycogen stores may be important for cardiac function.
    • Glucose-insulin-potassium (GIK) infusions are used in some cardiac procedures.

    Purpose of the Study:

    • To investigate the effect of preoperative glucose infusion on myocardial glycogen levels during coronary artery bypass surgery.
    • To compare clinical and hemodynamic outcomes between patients receiving glucose and those receiving saline.

    Main Methods:

    • 30 patients received preoperative GIK infusion with glucose in cardioplegia.
    • 30 control patients received saline infusion with no glucose in cardioplegia.
    • Myocardial glycogen levels were assessed before bypass and after cardioplegic arrest.

    Main Results:

    • No significant difference in clinical or hemodynamic parameters between groups.
    • Preoperative myocardial glycogen levels were similar in both groups.
    • Patients receiving glucose maintained normal myocardial glycogen levels after cardioplegic arrest, unlike the control group.

    Conclusions:

    • Preoperative glucose infusion, as part of GIK, helps maintain myocardial glycogen stores during cardiac arrest.
    • While not affecting immediate clinical outcomes, preserved glycogen may offer long-term myocardial protection.
    • Further research is needed to elucidate the clinical significance of maintained glycogen levels.

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