Behaviour of canine pulmonary vagal afferent receptors during sustained acute pulmonary venous pressure elevation.
Population
Canine model (dogs)
Comparison
Acute sustained increase in pulmonary venous… vs Baseline (control levels prior to stimulus)
Design
Preclinical
Follow-up
15 minutes
Authors
Discussion
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Implication
May elucidate vagal afferent responses to pulmonary venous pressure; hypothesis-generating for human cardiorespiratory reflexes.
Key Points
- This study aims to evaluate how acute increases in pulmonary venous pressure affect different types of pulmonary receptors in dogs.
- Studied the effects of sustained pulmonary venous pressure elevation due to partial mitral valve obstruction in dogs.
- Examined activity changes in slowly adapting, rapidly adapting, pulmonary C-fibre, and bronchial C-fibre receptors.
- Increased left atrial pressure in graded steps to measure receptor responses over time.
- Fifteen slowly adapting and eleven rapidly adapting receptors showed significant activity increases at a pressure elevation of 9.4 mmHg.
- Increases in receptor activity occurred within 1 minute of pressure elevation and returned to baseline within 1 minute after removal.
- Rapidly adapting receptors exhibited the most pronounced changes, highlighting their sensitivity to minor pressure increases.
Structured PICO
P
Population
Canine model (dogs)
I
Intervention
Acute sustained increase in pulmonary venous pressure induced by partial obstruction of the mitral valve
C
Comparator
Baseline (control levels prior to stimulus)
O
Outcome
Activity of pulmonary vagal afferent receptors (slowly adapting, rapidly adapting, pulmonary C-fibre, and bronchial C-fibre)surrogate
In a canine model, acute elevation of pulmonary venous pressure significantly increases the activity of most pulmonary vagal afferent receptors, particularly rapidly adapting receptors.
Cite This Study
Kappagoda et al. (1987) studied this question.