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Related Experiment Videos

Pulmonary arterial transit times.

C A Dawson1, R L Capen, L P Latham

  • 1Department of Physiology, Medical College of Wisconsin, Milwaukee 53226.

Journal of Applied Physiology (Bethesda, Md. : 1985)
|August 1, 1987
PubMed
Summary
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Investigating pulmonary arterial transport in dogs, this study found significant dye dispersion upstream from arterioles. This dispersion is comparable to that in capillaries, highlighting its importance in overall lung transport dynamics.

Area of Science:

  • Pulmonary circulation dynamics
  • Physiological fluid transport

Background:

  • Understanding pulmonary arterial transport is crucial for diagnosing and treating lung diseases.
  • Previous studies have focused on overall lung dispersion, with less known about upstream arterial contributions.

Purpose of the Study:

  • To characterize the transport function and dispersion of a bolus within the pulmonary arterial system from the main artery to subpleural arterioles.
  • To quantify the mean transit time and dispersion of blood flow in this arterial segment.

Main Methods:

  • Rapid injection of radiopaque and fluorescence dyes into the right atrium of anesthetized dogs.
  • Measurement of dye concentrations in the main pulmonary artery and subpleural arterioles over time.
  • Numerical deconvolution and moment analysis of concentration-time curves to determine transport function.

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Main Results:

  • The mean transit time from the main pulmonary artery to arterioles averaged 1.94 seconds, with a standard deviation of 1.23 seconds.
  • Relative dispersion was approximately 64%, comparable to that observed in the entire lung.
  • Dispersion upstream from arterioles is significant and comparable to dispersion in capillaries and veins.

Conclusions:

  • Dispersion in the pulmonary arterial tree upstream from arterioles contributes significantly to overall lung transport.
  • Variations in mean transit times between individual arteriole stream tubes are a notable factor in pulmonary arterial dispersion.