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On-line cardiac output by digital computer

F Huber, I E Sodal, J V Weil

    Journal of Applied Physiology
    |February 1, 1976
    PubMed
    Summary
    This summary is machine-generated.

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    This study presents an on-line computer system for accurate cardiac output calculation using the Stewart-Hamilton method. The system minimizes errors from assumptions, improving precision in dye-dilution curve analysis.

    Area of Science:

    • Cardiovascular Physiology
    • Medical Instrumentation
    • Computational Biology

    Background:

    • Conventional cardiac output devices often deviate from the Stewart-Hamilton method, leading to significant errors.
    • Accurate measurement of cardiac output is crucial for diagnosing and managing various cardiovascular conditions.

    Purpose of the Study:

    • To develop and validate an on-line computer system for precise cardiac output calculation using the classical Stewart-Hamilton method.
    • To address and mitigate errors introduced by common assumptions in existing cardiac output measurement devices.

    Main Methods:

    • Implemented a digital filter to smooth dye-dilution curves and eliminate heartbeat noise.
    • Utilized the exponential property of recirculation for accurate removal.
    • Developed quality control metrics including baseline length, exponential fit, and a figure of merit based on the five tanks-in-series model.

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    Main Results:

    • The on-line system demonstrated high accuracy, with a mean difference of only 150 ml compared to hand calculations.
    • For simulated dye curves, the computer system achieved a standard deviation of 10 ml, significantly outperforming hand calculations (SD = 200 ml).
    • Visual checks via CRT display of curves and parameters ensured data integrity.

    Conclusions:

    • The developed on-line system provides a reliable and accurate method for cardiac output determination via dye-dilution.
    • This system offers a significant improvement in precision and error reduction compared to traditional methods and manual calculations.