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Pulmonary flow resistance.

J Milic-Emili1

  • 1Meakins-Christie Laboratories, McGill University, Montreal, Quebec, Canada.

Lung
|January 1, 1989
PubMed
Summary
This summary is machine-generated.

Pulmonary flow resistance (RL) decreases with higher airflow and increases with lung volume, contrary to past assumptions. This is primarily due to tissue viscoelasticity, which is more significant than airway resistance during normal breathing.

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Area of Science:

  • Respiratory physiology
  • Pulmonary mechanics

Background:

  • Traditionally, pulmonary flow resistance (RL) was thought to increase with flow and decrease with lung volume.
  • This study challenges conventional understanding of pulmonary mechanics.

Purpose of the Study:

  • To investigate the relationship between pulmonary flow resistance, airflow, and lung volume.
  • To elucidate the underlying mechanisms of pulmonary resistance, particularly the role of viscoelasticity.

Main Methods:

  • Analysis of pulmonary resistance under varying airflow rates and lung volumes.
  • Assessment of dynamic pressure dissipations and viscoelastic phenomena in pulmonary tissues.

Main Results:

  • Pulmonary flow resistance (RL) was observed to decrease with increasing airflow, up to 3-4 times resting rates.

Related Experiment Videos

  • RL was found to increase progressively with increasing lung volume.
  • Viscoelastic phenomena within pulmonary tissues were identified as the primary driver of these resistance changes.

    • Conclusions:

    • The study refutes the traditional view of pulmonary flow resistance.
    • Viscoelastic properties of lung tissue significantly influence pulmonary resistance, exceeding airway resistance during resting breathing.