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Related Experiment Videos

Does pulsatile flow improve perfusion during hypothermic cardiopulmonary bypass?

R K Singh, B G Barratt-Boyes, E A Harris

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

    This study found no significant difference in physiological outcomes between standard roller pump flow and pulsatile flow during hypothermic cardiopulmonary bypass. Both methods of flow delivery during surgery yielded similar patient results.

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    Area of Science:

    • Cardiovascular Surgery
    • Biomedical Engineering
    • Physiology

    Background:

    • Hypothermic cardiopulmonary bypass is a critical procedure in cardiac surgery.
    • The delivery of blood flow during bypass, whether standard or pulsatile, may impact patient physiology.
    • Optimizing flow dynamics during cardiopulmonary bypass is essential for patient outcomes.

    Purpose of the Study:

    • To compare the physiological effects of standard roller pump flow versus pulsatile flow during hypothermic cardiopulmonary bypass.
    • To evaluate the impact of flow type on oxygen consumption, lactate levels, vascular resistance, and thermal gradients.
    • To determine if pulsatile flow offers advantages over standard flow in maintaining physiological stability.

    Main Methods:

    • Ten patients undergoing hypothermic cardiopulmonary bypass were studied.

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  • Each patient received both standard roller pump flow and pulsatile flow (using a pulsatile assist device) in a randomized order at the same mean flow rate.
  • Physiological variables including oxygen consumption, blood lactate, systemic vascular resistance, urinary flow, and thermal gradients were measured during and after rewarming.

    • Main Results:

    • No significant differences were observed in whole-body oxygen consumption between standard and pulsatile flow.
    • Blood lactate concentration, systemic vascular resistance, and urinary flow showed no significant variations between the two flow types.
    • Thermal gradients between core tissues and muscle remained similar after rewarming, irrespective of the flow method used during bypass.

    Conclusions:

    • The use of a pulsatile assist device during hypothermic cardiopulmonary bypass did not demonstrate significant physiological advantages over standard roller pump flow.
    • Both standard and pulsatile flow appear to be equally effective in maintaining key physiological parameters during and after cardiac surgery.
    • Further research may be needed to explore potential long-term or specific patient subgroup benefits of pulsatile flow.