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Related Experiment Videos

Dog lymph flow in increased capillary permeability states.

D K Adcock, R E Drake, R L Scott

    Microvascular Research
    |May 1, 1983
    PubMed
    Summary

    Lung edema increases lymph flow by decreasing lymph vessel resistance and increasing lymph driving pressure. These changes in lymphatic parameters are key to understanding fluid dynamics in lung edema.

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    Area of Science:

    • Pulmonary Physiology
    • Lymphatic System Dynamics

    Background:

    • Lung lymph flow rate (QL) increases during edema, a condition often caused by elevated lung microvascular permeability.
    • The rise in QL may stem from reduced lymph vessel resistance (RL), increased lymph driving pressure (PL), or both.

    Purpose of the Study:

    • To investigate the specific changes in lymph vessel resistance (RL) and lymph driving pressure (PL) that contribute to increased lung lymph flow (QL) in edema.
    • To quantify the relationship between QL, RL, and PL under conditions of increased microvascular permeability.

    Main Methods:

    • Utilized cannulated dog lung lymph vessels to measure lymph flow rate (QL) and outflow pressure (PO).
    • Estimated RL and PL using the linear relationship between QL and PO.
    • Induced edema by administering alloxan to increase lung microvascular permeability and by increasing capillary pressures.

    Main Results:

    • Alloxan-induced edema significantly increased QL (24.5 to 112 µL/min), decreased RL (0.35 to 0.11 cm H2O min/µL), and increased PL (8.5 to 15.9 cm H2O).
    • Further increases in capillary pressure amplified QL (to 169.9 µL/min), with a notable additional increase in PL and a smaller additional decrease in RL.
    • Demonstrated a significant alteration in the QL vs. PO relationship during edema.

    Conclusions:

    • Increased lung lymph flow in edema secondary to microvascular permeability is characterized by a decrease in lymph vessel resistance (RL) and an increase in lymph driving pressure (PL).
    • These findings provide a quantitative understanding of lymphatic compensation mechanisms in pulmonary edema.

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