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Lung lymph flow during volume infusions.

J C Gabel, K D Fallon, G A Laine

    Journal of Applied Physiology (Bethesda, Md. : 1985)
    |February 1, 1986
    PubMed
    Summary
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    Intravenous fluid infusions increase lung lymph flow by reducing vessel resistance. However, elevated venous pressure during infusions can impede lymph flow, potentially causing lung fluid accumulation.

    Area of Science:

    • Physiology
    • Pulmonary Medicine
    • Fluid Dynamics

    Background:

    • Intravenous fluid administration is common in clinical settings.
    • Understanding its impact on pulmonary fluid balance is crucial.
    • Lung lymph flow is a key indicator of fluid accumulation in the lungs.

    Purpose of the Study:

    • To investigate the effects of intravenous isotonic crystalloid infusion on lung lymph flow.
    • To determine the influence of systemic venous pressure on this process.

    Main Methods:

    • Cannulation of tracheobronchial lung lymph vessels in anesthetized dogs.
    • Measurement of lymph flow against atmospheric pressure (QL) and against systemic venous pressure (QLV).
    • Infusion of Ringer solution at varying rates to alter venous pressure.

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    Main Results:

    • Isotonic crystalloid infusion increased lung lymph flow (QL and QLV).
    • Increases in lymph flow were primarily due to reduced lymph vessel resistance.
    • Elevated systemic venous pressure during infusion significantly blunted or abolished lymph flow (QLV).

    Conclusions:

    • Intravenous fluid infusions can increase lung lymph flow.
    • Elevations in venous pressure accompanying fluid infusions oppose lung lymph flow.
    • This opposition may contribute to excess fluid accumulation in the lungs.