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A density method to quantify pulmonary microvascular hematocrit.

J S Lee, L P Lee, M V Evans

    Microvascular Research
    |September 1, 1985
    PubMed
    Summary
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    This study shows that measuring changes in venous blood density can quantify microvascular hematocrit in the lungs. This method estimates red blood cell levels within pulmonary capillaries.

    Area of Science:

    • Physiology
    • Cardiovascular System
    • Pulmonary Circulation

    Background:

    • The relationship between blood pressure and red blood cell (RBC) distribution in the lungs is complex.
    • Understanding microvascular hematocrit is crucial for assessing pulmonary function and blood flow dynamics.

    Purpose of the Study:

    • To develop a method for quantifying microvascular hematocrit in the lung.
    • To investigate the transient changes in hematocrit within pulmonary vasculature under elevated pressure.

    Main Methods:

    • Perfusing a canine lung lobe with autologous blood and measuring venous blood density changes.
    • Calculating the volume of released RBCs (Vr) and the increase in pulmonary vascular volume (V' - V).
    • Analyzing RBC and plasma flow dynamics and applying the Fahraeus effect to estimate microvascular hematocrit.

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    Main Results:

    • A ratio Vr/Ha/(V' - V) of 0.11 +/- 0.02 was found.
    • Estimated microvascular (tube) hematocrit in pulmonary capillaries to be 80% of the perfusing hematocrit.
    • Ruled out transcapillary filtration and capillary recruitment as explanations for the observed RBC volume increase.

    Conclusions:

    • Transient changes in venous blood density can accurately quantify lung microvascular hematocrit.
    • The Fahraeus effect significantly influences hematocrit distribution in pulmonary capillaries.
    • This non-invasive technique offers a novel approach to assess pulmonary capillary hematocrit.