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A constant temperature perfusion system for myocardial energetics

R A Niesler, D W Axon, M A Eggert

    Physics in Medicine and Biology
    |November 1, 1981
    PubMed
    Summary

    A new perfusion system precisely controls temperature for isolated working rat hearts, enabling accurate heat flow measurements and thermal event identification in myocardial energetics research.

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    Physics in medicine and biology·1981

    Area of Science:

    • Physiology
    • Biomedical Engineering
    • Thermodynamics

    Background:

    • Accurate temperature control is crucial for studying myocardial energetics.
    • Existing perfusion systems require refinement for precision thermal measurements.
    • Understanding heat flow in isolated organs is vital for metabolic and mechanical investigations.

    Purpose of the Study:

    • To develop a constant temperature perfusion system for precision heat flow measurements.
    • To establish temperature characteristics and quantify thermal events in isolated working rat hearts.
    • To refine perfusion systems for advanced myocardial energetics research.

    Main Methods:

    • Utilized a perfusion system with four heat exchangers for precise fluid temperature control (37 ± 10⁻⁴ °C).
    • Established system temperature characteristics and developed mathematical models.
    • Tested the system with isolated working rat hearts across a perfusion flow range of 0-100 cm³/min.

    Main Results:

    • Achieved precise temperature regulation of perfusion fluid to 37 ± 10⁻⁴ °C.
    • Successfully identified and quantified spurious thermal events using developed mathematical expressions.
    • Demonstrated system suitability for high-precision temperature measurements in isolated perfused organs.

    Conclusions:

    • The developed perfusion system meets the complete requirements for myocardial energetics studies.
    • The system offers a stabilized temperature baseline essential for thermal investigations.
    • This refinement enhances metabolic and mechanical investigations on isolated working hearts and other organs.

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