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The continuous thermodilution method for measuring high blood flows

S Häggmark, B Biber, J G Sjödin

    Scandinavian Journal of Clinical and Laboratory Investigation
    |June 1, 1982
    PubMed
    Summary
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    Continuous thermodilution accurately measures blood flow after formula modification. This method shows good agreement with electromagnetic flow measurement in vivo, offering reliable blood flow quantification.

    Area of Science:

    • Cardiovascular physiology
    • Medical instrumentation
    • Biomedical engineering

    Background:

    • Accurate blood flow measurement is critical in clinical settings.
    • Continuous thermodilution offers a potential method for real-time blood flow monitoring.
    • Previous methods had limitations in accuracy and applicability.

    Purpose of the Study:

    • To evaluate the accuracy of continuous thermodilution for blood flow measurement.
    • To address and correct for errors identified in the thermodilution method.
    • To compare continuous thermodilution with an established method in vivo.

    Main Methods:

    • In vitro evaluation of the continuous thermodilution technique.
    • Modification of the thermodilution formula based on flow model measurements.

    Related Experiment Videos

  • In vivo comparison with electromagnetic flow measurement in pig portal circulation.

    • Main Results:

    • In vitro experiments identified thermotransport as a source of temperature measurement error.
    • A modified thermodilution formula was developed to correct for this error.
    • In vivo, the modified continuous thermodilution method showed excellent agreement with electromagnetic flow measurement (r = 0.958).
    • In vivo precision: standard deviation of 19 ml/min, coefficient of variation of 1.6%.

    Conclusions:

    • The modified continuous thermodilution method provides accurate blood flow measurements.
    • This technique is reliable for in vivo applications, particularly in portal blood flow.
    • The corrected method overcomes previous limitations and offers a valuable tool for blood flow assessment.