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Related Experiment Videos

Physiological parameters of indicator dilution curves.

L D Homer, A Small

    The American Journal of Physiology
    |September 1, 1977
    PubMed
    Summary
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    A new five-parameter model accurately analyzes indicator dilution curves, providing reliable estimates for cardiac output and clearance in physiological studies. It also introduces a novel parameter for recirculation time distribution variance.

    Area of Science:

    • Physiology
    • Medical Physics
    • Pharmacokinetics

    Background:

    • Indicator dilution curves are crucial for assessing cardiovascular function and drug disposition.
    • Existing models may not fully capture the complexities of indicator transit and recirculation.

    Purpose of the Study:

    • To develop and validate a comprehensive five-parameter model for analyzing indicator dilution curves.
    • To evaluate the model's ability to estimate key physiological parameters like cardiac output and clearance.

    Main Methods:

    • Application of a novel five-parameter mathematical model to indicator dilution data.
    • Experimental validation using radioactively labeled diethylenetriaminepentaacetic acid in canine subjects.
    • Fitting the model to data collected over a 3-hour period post-injection.

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    Main Results:

    • The model successfully estimated cardiac output and clearance, showing good agreement with established methods.
    • Physiologically plausible values were obtained for time lag and volume of distribution.
    • A new parameter, the variance of recirculation time distribution, was introduced and discussed for its potential utility.

    Conclusions:

    • The developed five-parameter model offers a robust tool for analyzing indicator dilution curves.
    • It provides accurate and physiologically relevant estimations of cardiac and circulatory parameters.
    • The novel variance parameter may offer new insights into indicator transit dynamics.