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Related Experiment Videos

Cardiac output determination: thermodilution versus a new computerized Fick method.

J P Carpenter, S Nair, I Staw

    Critical Care Medicine
    |July 1, 1985
    PubMed
    Summary

    A new computerized system accurately measures respiratory gas exchange and calculates oxygen consumption (VO2). This system demonstrated high correlation and reproducibility for Fick cardiac output compared to traditional methods.

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    Area of Science:

    • Physiology
    • Medical Engineering
    • Respiratory Medicine

    Background:

    • Traditional methods for measuring respiratory gas exchange, such as Douglas bag analysis, can be time-consuming and less reproducible.
    • Accurate assessment of oxygen consumption (VO2) and carbon dioxide production is crucial for evaluating metabolic states and cardiac function.

    Purpose of the Study:

    • To introduce and validate a novel computerized system for on-line analysis of respiratory function.
    • To compare the accuracy and reproducibility of the computerized system with traditional methods for determining key physiological parameters.

    Main Methods:

    • A computerized system was developed for real-time measurement of respiratory flow and analysis of inspired/expired gases.
    • Oxygen consumption (VO2) and carbon dioxide production were computed using the system.

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  • The system's performance was evaluated by comparing computed Fick cardiac output with simultaneously measured thermodilution cardiac output.

    • Main Results:

    • The computerized system provided complete on-line analysis of respiratory gas exchange.
    • Computed oxygen consumption (VO2) and carbon dioxide production correlated well with traditional Douglas bag determinations.
    • Fick cardiac output derived from the computerized system showed high correlation (r = .92, p < .001) with simultaneous thermodilution cardiac output.
    • The computerized Fick method exhibited significantly greater reproducibility than traditional methods.

    Conclusions:

    • The described computerized system offers a reliable and reproducible method for on-line respiratory gas exchange analysis.
    • This technology provides an accurate alternative for calculating Fick cardiac output, improving upon traditional methods.
    • The system has the potential to enhance clinical and research applications requiring precise metabolic and hemodynamic measurements.