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Related Experiment Videos

Controlled sequential pacing in isolated perfused auxiliary rat hearts.

O C Penn, S T Boyd, J B Korrûbel

    European Journal of Cardiology
    |September 1, 1979
    PubMed
    Summary

    Sequential pacing of auxiliary hearts improves cardiac output and coronary flow, especially when one heart is compromised. This method may benefit patients undergoing auxiliary heart transplantation.

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    Area of Science:

    • Cardiology
    • Cardiac Surgery
    • Transplantation Biology

    Background:

    • Auxiliary heart transplantation aims to support or replace a failing heart.
    • Optimizing the function of both native and transplanted hearts is crucial for patient outcomes.
    • Controlled pacing strategies require investigation to enhance graft and recipient heart synergy.

    Purpose of the Study:

    • To compare the hemodynamic effects of spontaneous beating versus different controlled pacing modes (random, simultaneous, sequential) in a double rat heart model.
    • To evaluate the potential benefits of sequential pacing in a scenario mimicking compromised cardiac function, such as after coronary artery ligation.

    Main Methods:

    • An isolated perfused working double rat heart model was utilized, with atria connected to simulate clinical auxiliary heart transplantation.

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  • Hemodynamic parameters including peak systolic pressure, diastolic pressure, cardiac output, coronary flow, and myocardial oxygen consumption were measured under spontaneous beating and three pacing conditions.

    • Main Results:

    • Sequential pacing led to improved cardiac output (10-30 ml/min) and increased coronary flow in a compromised heart model.
    • Simultaneous pacing resulted in higher systolic pressure but lower coronary flow and higher oxygen uptake compared to sequential pacing.
    • Sequential pacing increased myocardial oxygen consumption (80-110 µL/g/min) without associated enzyme release, suggesting improved diastolic perfusion.

    Conclusions:

    • Sequential pacing demonstrates potential benefits for improving hemodynamics in auxiliary heart transplantation, particularly when the recipient heart function is depressed.
    • The observed improvements in cardiac output and coronary flow with sequential pacing warrant further investigation in clinical settings.
    • Controlled sequential pacing may offer a protective strategy for the diseased recipient heart in auxiliary transplantation.