Related Experiment Videos
Respiratory drive and timing during assisted ventilation in dogs
Respiration; International Review of Thoracic Diseases
|January 1, 1986
Summary
Assisted ventilation (AV) in dogs reduced ventilatory drive but did not alter inspiratory off-switch volume or duration. Vagotomy abolished this reduction, suggesting a role for vagal feedback in regulating breathing during AV.
Area of Science:
- Physiology
- Respiratory Medicine
- Animal Studies
Background:
- Understanding the neural control of breathing is crucial for managing respiratory failure.
- Assisted ventilation (AV) can influence ventilatory drive and respiratory muscle activity.
- The role of vagal feedback during AV requires further elucidation.
Purpose of the Study:
- To investigate the impact of AV on ventilatory drive, inspiratory off-switch volume (Voff), and diaphragmatic activity duration (Tdi).
- To explore the influence of vagotomy on these parameters during AV.
Main Methods:
- Studied 8 anesthetized dogs under isocapnic hyperoxia.
- Measured diaphragmatic electromyogram (EMG) using implanted electrodes.
- Assessed ventilatory drive via EMG 0.3 index.
- Performed vagotomy in some animals.
Main Results:
- AV significantly decreased ventilatory drive (EMG 0.3).
- AV did not affect Voff or Tdi.
- Vagotomy abolished the AV-induced reduction in drive and potentially increased it.
Conclusions:
- Assisted ventilation suppresses ventilatory drive in dogs.
- Vagal afferents play a significant role in modulating ventilatory drive during AV.
- Diaphragmatic activity duration and off-switch volume are not directly affected by AV in this model.