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Related Experiment Videos

Phasic activity in the airways smooth muscle.

J García Ramos1

  • 1Laboratorio de Neurofisiología, Facultad de Medicina, Universidad Autónoma de Querétaro, México.

Acta Physiologica, Pharmacologica Et Therapeutica Latinoamericana : Organo De La Asociacion Latinoamericana De Ciencias Fisiologicas Y [De] La Asociacion Latinoamericana De Farmacologia
|January 1, 1991
PubMed
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Respiratory oscillations in cats and rats are linked to vagal stimulation and sympathetic control of airway smooth muscle. Mechanical factors like pressure and lung distension also play a role.

Area of Science:

  • Physiology
  • Respiratory System Mechanics

Background:

  • Oscillations in breathing pressure/flow records are common in anesthetized animals.
  • These oscillations have been observed to share properties with vagal stimulation responses.

Purpose of the Study:

  • To further investigate the nature of respiratory oscillations.
  • To differentiate these oscillations from known tone changes.
  • To explore the role of mechanical factors and sympathetic control.

Main Methods:

  • Observations in anesthetized cats and rats.
  • Examining interference patterns with vagal stimulation.
  • Applying pressure pulses to the tracheal cannula.
  • Studying responses to sudden lung distension.

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Main Results:

  • Oscillations confirmed to interfere with vagal stimulation responses.
  • Oscillations confirmed as distinct from tone changes.
  • Oscillations shown to depend on sympathetic control of airway smooth muscle.
  • Mechanical factors (pressure, volume, airflow rate) identified as important stimuli.
  • Initial bronchial wall tension found to be significant.

Conclusions:

  • Mechanical stimulation of airways is effective under facilitatory sympathetic influence.
  • Sympathetic system plays a key role in modulating airway smooth muscle activity.
  • Respiratory oscillations are a complex phenomenon involving both mechanical and neural factors.