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Related Experiment Videos

Active lymphatic pumping and sheep lung lymph flow.

R E Drake1, D Weiss, J C Gabel

  • 1Center for Microvascular and Lymphatic Studies, University of Texas Medical School, Houston 77030.

Journal of Applied Physiology (Bethesda, Md. : 1985)
|July 1, 1991
PubMed
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Active lymphatic pumping significantly influences lung lymph flow. A new mathematical model, using lymphatic pumping data, accurately simulates sheep lung lymph flow, distinguishing active and passive factors.

Area of Science:

  • Physiology
  • Biophysics
  • Mathematical modeling

Background:

  • Lymph flow regulation is complex, involving both active lymphatic pumping and passive factors.
  • Differentiating the contributions of active versus passive mechanisms to lung lymph flow is experimentally challenging.
  • Nonlinear relationships exist between lymphatic pumping activity and transmural pressure, and between lung lymph flow and outflow pressure.

Purpose of the Study:

  • To develop a mathematical model of the lymphatic pump to analyze its influence on lung lymph flow.
  • To test if lymphatic pumping activity data can describe observed lung lymph flow patterns in sheep.
  • To provide a tool for distinguishing active pumping from passive factors in lymph flow regulation.

Main Methods:

  • Utilized published data on lymphatic pumping activity (stroke volume and frequency).

Related Experiment Videos

  • Developed a mathematical model simulating the function of an isolated lymphatic vessel segment.
  • Compared model-generated flow-outflow pressure relationships with experimental data from awake sheep.

    • Main Results:

    • Simulations from the mathematical model closely matched the nonlinear flow-outflow pressure data observed in sheep.
    • The model successfully replicated the complex interplay between lymphatic pumping and outflow pressure.
    • The findings support the significant role of active lymphatic pumping in lung lymph flow.

    Conclusions:

    • Both active lymphatic pumping and passive factors contribute to lung lymph flow.
    • The developed mathematical model offers a method to differentiate the effects of active pumping versus passive factors.
    • This model can aid future research into the regulation of lymph flow.