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Related Experiment Videos

Digital cutaneous fluorometry: correlation between blood flow and fluorescence.

F S Bongard, R A Upton, V B Elings

    Journal of Vascular Surgery
    |September 1, 1984
    PubMed
    Summary
    This summary is machine-generated.

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    This study demonstrates that tissue fluorescence intensity, measured using a digital dermofluorometer, is directly proportional to blood flow. This finding validates fluorescein

    Area of Science:

    • Vascular biology
    • Biomedical engineering
    • Diagnostic imaging

    Background:

    • Accurate vascular diagnosis relies on fluorescence intensity being proportional to blood flow.
    • Digital dermofluorometry enables quantitative measurement of cutaneous fluorescence.

    Purpose of the Study:

    • To establish the relationship between blood flow and tissue fluorescence intensity.
    • To validate the use of fluorescein in assessing vascular perfusion.

    Main Methods:

    • Experimental reduction of distal aortic flow in rabbits.
    • Measurement of hind- and forelimb fluorescence post-sodium fluorescein injection.
    • Analysis of plasma fluorescein concentration and tissue fluorescence kinetics.

    Main Results:

    Related Experiment Videos

    • A significant linear relationship (p<0.05, r>0.75) was found between residual aortic flow and hind-/forelimb fluorescence ratio (20-60 min post-injection).
    • Plasma fluorescein decayed rapidly (t1/2=12.5 min) irrespective of aortic occlusion.
    • Cutaneous fluorescence kinetics indicated interstitial, not intravascular, fluorescein was responsible for measurements.

    Conclusions:

    • Tissue fluorescence intensity is linearly related to blood flow, enabling perfusion assessment.
    • Relative fluorescence measurements are valid for evaluating perfusion between 20 and 60 minutes post-fluorescein injection.
    • Fluorescein's interstitial diffusion, influenced by time and flow, dictates fluorescence curve dynamics.