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Airflow and normal lung sounds.

B E Shykoff1, Y Ploysongsang, H K Chang

  • 1Biomedical Engineering Unit, McGill University, Montreal, Quebec, Canada.

The American Review of Respiratory Disease
|April 1, 1988
PubMed
Summary
This summary is machine-generated.

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Normal breath sounds correlate with air flow, specifically varying with the square of flow rate during inspiration. Body position and breathing patterns affect sound intensity but not this fundamental relationship.

Area of Science:

  • Respiratory physiology
  • Bioacoustics
  • Pulmonary mechanics

Background:

  • Understanding lung sound generation is crucial for diagnosing respiratory conditions.
  • Previous research has explored factors influencing lung sounds, but the precise relationship with airflow dynamics requires further elucidation.

Purpose of the Study:

  • To investigate the quantitative relationship between total airflow and normal breath sounds.
  • To determine how body position and breathing patterns influence this relationship.

Main Methods:

  • Breath sounds were recorded at two chest sites.
  • Measurements were taken during rhythmic breathing, flow rate tracking, and flow rate tracking against resistance.
  • Subjects were tested in seated and left lateral decubitus positions.

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Main Results:

  • A direct relationship was observed between sound amplitude during inspiration and the square of airflow at the mouth.
  • Subject position and breathing patterns modified the gain between airflow squared and sound amplitude.
  • The fundamental functional relationship remained consistent across different conditions.

Conclusions:

  • Breath sound amplitude is directly proportional to the square of airflow during inspiration.
  • While position and breathing affect sound intensity, the core physical relationship between airflow and sound generation is preserved.