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Related Experiment Videos

A recirculating cooling system for improved topical cardiac hypothermia

F L Rosenfeldt, A Fambiatos, J Pastoriza-Pinol

    The Annals of Thoracic Surgery
    |October 1, 1981
    PubMed
    Summary

    A novel recirculating cooling system effectively lowers myocardial temperatures during cardiac surgery. This system offers superior cooling compared to conventional methods, enhancing patient safety in hypothermic cardioplegia procedures.

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    Area of Science:

    • Cardiovascular Surgery
    • Medical Device Technology

    Background:

    • Topical cardiac hypothermia is crucial for protecting the myocardium during cardiac procedures.
    • Conventional fluid-discard cooling systems have limitations in maintaining consistent low temperatures.

    Purpose of the Study:

    • To describe a simple, disposable recirculating cooling system for topical cardiac hypothermia.
    • To evaluate the efficacy of this system in reducing myocardial temperatures compared to conventional methods.

    Main Methods:

    • A novel recirculating cooler system capable of delivering fluid at 2-4°C and 1,500 ml/min was developed.
    • The system's performance was assessed in 22 patients undergoing coronary artery bypass grafting.
    • Myocardial and septal temperatures were monitored during hypothermic cardioplegia.

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    Main Results:

    • The recirculating cooler achieved significantly lower myocardial temperatures than the conventional fluid-discard system.
    • Septal temperatures were maintained below 20°C for over 60 minutes in more than 600 patients.
    • No reinfusion of cardioplegic solution was required during cardiac procedures.

    Conclusions:

    • The described recirculating cooling system is effective and safe for topical cardiac hypothermia.
    • This system provides superior myocardial temperature management during hypothermic cardioplegia.
    • Its disposable nature and efficiency make it a valuable tool in cardiac surgery.