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Related Experiment Videos

Negative wave reflections in pulmonary arteries.

E H Hollander1, J J Wang, G M Dobson

  • 1Departments of Medicine and Physiology and Biophysics, Cardiovascular Research Group, University of Calgary, Calgary, Alberta, Canada, T2N 4N1.

American Journal of Physiology. Heart and Circulatory Physiology
|July 17, 2001
PubMed
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Pulmonary arterial wave reflection, characterized by backward-going expansion waves, facilitates right ventricular ejection. This effect intensifies with increased blood volume and positive end-expiratory pressure (PEEP).

Area of Science:

  • Cardiovascular Physiology
  • Pulmonary Circulation Dynamics
  • Biomedical Engineering

Background:

  • The pulmonary arterial branching pattern may cause early systolic forward-going compression waves (FCW) to reflect as backward-going expansion waves (BEW).
  • Understanding pulmonary wave reflection is crucial for assessing cardiovascular function and right ventricular performance.

Purpose of the Study:

  • To investigate pulmonary arterial wave reflection patterns in response to varying physiological conditions.
  • To quantify the reflection coefficient (R) under different blood volumes, positive end-expiratory pressure (PEEP), and hypoxic states.

Main Methods:

  • Utilized wave-intensity analysis in 11 open-chest anesthetized dogs.
  • Measured proximal pulmonary arterial pressure and flow (velocity).

Related Experiment Videos

  • Evaluated wave reflection under low-volume, high-volume, high-volume + PEEP, and hypoxic conditions.

    • Main Results:

    • Negative wave reflection (BEW) was observed, with R increasing in absolute magnitude from -0.07 ± 0.02 (low-volume) to -0.20 ± 0.04 (high-volume).
    • Positive end-expiratory pressure (PEEP) further increased negative reflection (R = -0.26 ± 0.02).
    • Hypoxia induced a backward-going compression wave (BCW) with R = +0.09 ± 0.03.

    Conclusions:

    • Pulmonary arterial circulation in dogs exhibits negative wave reflection that aids right ventricular ejection.
    • Increased blood volume and PEEP enhance this beneficial wave reflection.
    • Hypoxia alters wave reflection dynamics, introducing a backward-going compression wave.