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Related Experiment Videos

Is atrial function affected by conventional cardioplegic arrest?

P A Spence, C M Peniston, R D Weisel

    The Journal of Surgical Research
    |May 1, 1985
    PubMed
    Summary
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    Conventional cardioplegic arrest impairs right atrial function, potentially causing ischemia and arrhythmias. Cardiopulmonary bypass alone did not alter atrial function, suggesting cardioplegia is the cause of dysfunction.

    Area of Science:

    • Cardiac Surgery
    • Cardiovascular Physiology
    • Thoracic Surgery

    Background:

    • Persistent atrial electrical and mechanical activity during cardioplegic arrest may lead to atrial ischemia.
    • Atrial ischemia is a potential cause of postoperative arrhythmias and impaired atrial transport function.

    Purpose of the Study:

    • To evaluate the effects of conventional cardioplegic arrest (CCA) versus simple cardiopulmonary bypass (CPB) on right atrial function.
    • To determine if CCA or CPB contributes to right atrial dysfunction.

    Main Methods:

    • Isolated right atrial preparation in pigs (n=7 per group).
    • Assessment of right atrial function using a compliant balloon inserted via the superior vena cava.
    • Comparison of developed pressure, diastolic pressure, and dP/dt after 1 hour of reperfusion.

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    Main Results:

    • CCA significantly deteriorated right atrial function, indicated by reduced developed pressure, increased diastolic pressure, and decreased dP/dt.
    • CPB alone did not alter right atrial pressures but showed a late decrease in dP/dt.
    • CCA-induced functional deficits were more pronounced than those observed with CPB alone.

    Conclusions:

    • Conventional cardioplegic arrest is associated with ischemic dysfunction of the right atrium.
    • The findings support the hypothesis that persistent atrial activity during cardioplegic arrest contributes to atrial ischemia and dysfunction.