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Effect of upper airway pressure pulses on breathing pattern
Respiration Physiology
|October 1, 1986
Summary
Applying negative pressure pulses to the upper airway during early inspiration inhibits breathing. The timing of pressure pulse application significantly impacts respiratory responses, affecting inspiratory duration.
Area of Science:
- Respiratory Physiology
- Pulmonary Mechanics
Background:
- Understanding the control of breathing is crucial for respiratory medicine.
- Upper airway reflexes play a significant role in modulating respiratory patterns.
Purpose of the Study:
- To investigate the impact of the timing of upper airway pressure pulse application on breathing patterns.
- To determine how negative and positive pressure pulses applied at different respiratory phases affect respiratory parameters.
Main Methods:
- 19 anesthetized, spontaneously breathing rabbits were used.
- A closed upper airway system and a servo-respirator triggered by diaphragmatic activity were employed.
- Negative and positive pressure pulses were applied during early and late inspiration/expiration.
Main Results:
- Early inspiratory negative pressure pulses ( -5 to -15 cm H2O) caused reversible inspiratory inhibition (86.2%), prolonging inspiratory duration (TI) and decreasing mean inspiratory drive.
- Late inspiratory negative pressure pulses primarily shortened TI.
- Positive pressure pulses during expiration prolonged subsequent TI regardless of application timing.
Conclusions:
- The timing of upper airway pressure pulse application is a critical factor influencing respiratory responses.
- Different pressure profiles and application timings elicit distinct effects on breathing pattern parameters like TI and TE.