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Temperature distribution cannot predict local cardiac metabolism.

P Duijst, G Elzinga, N Westerhof

    The American Journal of Physiology
    |March 1, 1987
    PubMed
    Summary
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    Local myocardial metabolism can be predicted from heat loss measurements. Transmural temperature distribution accurately estimates metabolism at physiological coronary blood flow rates, but not at increased flow.

    Area of Science:

    • Cardiovascular Physiology
    • Biomedical Engineering
    • Metabolic Heat Production

    Background:

    • Myocardial metabolism generates heat, which is dissipated by coronary blood flow and diffusion.
    • Understanding local heat production is crucial for assessing cardiac function.

    Purpose of the Study:

    • To determine if transmural temperature distribution can predict local myocardial metabolism.
    • To compare measured convectional heat loss with predictions based on oxygen consumption.

    Main Methods:

    • Measured coronary blood flow and transcoronary temperature differences to calculate convectional heat loss.
    • Estimated endocardial and epicardial heat production using transmural temperature distribution and local flow/oxygen consumption.
    • Utilized radioactive microspheres for local flow measurements.

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    Main Results:

    • Measured and predicted convectional heat loss showed no significant difference.
    • The ratio of temperature distribution to oxygen consumption (AT/AO2) was near unity for physiological flow rates (≤100 ml x min⁻¹ x 100 g⁻¹).
    • This ratio decreased significantly at higher flow rates, particularly in the endocardium.

    Conclusions:

    • Overall left ventricular metabolism can be predicted from conventional heat loss.
    • Transmural temperature distribution effectively predicts local metabolism under physiological, but not elevated, coronary blood flow conditions.