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Sinoatrial function after cardiac transplantation.

R S Bexton, A W Nathan, K J Hellestrand

    Journal of the American College of Cardiology
    |March 1, 1984
    PubMed
    Summary
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    Cardiac transplant recipients often have sinus node dysfunction. Donor sinus nodes function predictably, while recipient nodes show chaotic responses and prolonged recovery times, indicating impaired function in asymptomatic survivors.

    Area of Science:

    • Cardiology
    • Transplant Surgery

    Background:

    • Cardiac transplantation involves replacing the recipient's heart with a donor heart, necessitating assessment of the sinus node function in both.
    • Understanding sinus node function is crucial for managing long-term outcomes in transplant recipients.

    Purpose of the Study:

    • To evaluate and compare the sinoatrial (SA) node function of denervated donor and innervated recipient sinus nodes in asymptomatic cardiac transplant recipients.
    • To investigate the reliability of SA node function tests in donor versus recipient nodes.

    Main Methods:

    • Sinoatrial function tests were performed on 14 donor and 10 recipient atria from asymptomatic cardiac transplant recipients.
    • Spontaneous cycle length, sinus node recovery time, and sinoatrial conduction time were measured under various pacing conditions (alone and synchronous).

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    Main Results:

    • Recipient atria exhibited significantly longer spontaneous cycle lengths and prolonged recovery times compared to donor atria.
    • Pacing response patterns were organized in donor nodes but chaotic in recipient nodes.
    • Synchronous pacing prolonged recipient sinus node recovery time, unlike donor nodes, and recipient SA conduction time lacked correlation with standard measurements.

    Conclusions:

    • Asymptomatic cardiac transplant recipients have a high incidence of recipient sinus node dysfunction.
    • Donor sinus node function tests, in the absence of autonomic influences, yield more predictable and clinically reliable results than in intact subjects.
    • Recipient sinus node dysfunction may persist long-term post-transplantation.