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Related Experiment Videos

Cardiac hypothermia evaluated by ultrastructural studies in man.

H Engedal, E Skagseth, T S Saetersdal

    The Journal of Thoracic and Cardiovascular Surgery
    |April 1, 1978
    PubMed
    Summary

    Cardiac hypertrophy, not ischemia, caused cellular damage in patients undergoing cardiopulmonary bypass. Deep hypothermia protected mitochondria during surgery, but structural changes persisted.

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    Area of Science:

    • Cardiovascular Surgery
    • Cardiac Pathology
    • Cellular Biology

    Background:

    • Cardiopulmonary bypass (CPB) involves cardiac arrest, posing risks to myocardial tissue.
    • Deep hypothermia is used to protect the heart during CPB, but its effects on hypertrophic myocardium require further investigation.

    Purpose of the Study:

    • To investigate the structural changes in hypertrophic myocardium during CPB with deep hypothermia.
    • To differentiate between cellular damage caused by intraoperative ischemia and that resulting from cardiac hypertrophy.

    Main Methods:

    • Transmural left ventricular biopsies were obtained from 13 patients undergoing CPB.
    • Biopsies were collected at baseline, after aortic cross-clamping, and after reperfusion.
    • Deep hypothermia (15°C) was employed during ischemic arrest.

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    Main Results:

    • Mitochondrial structure remained normal throughout the procedure.
    • Cellular alterations, including widened intercalated discs, edema, myelin figures, and myofibrillar lysis, were observed.
    • No clear correlation was found between the severity of structural injuries and the duration of aortic cross-clamping.

    Conclusions:

    • The observed cellular alterations in hypertrophic myocardium are likely a consequence of cardiac hypertrophy itself.
    • Deep hypothermia effectively protected mitochondrial integrity during CPB.
    • Intraoperative ischemia time did not appear to be the primary driver of observed cellular damage in this cohort.