Related Experiment Videos
Sleep fragmentation and ventilatory responsiveness to hypercapnia
H Espinoza1, A T Thornton, D Sharp
1Department of Thoracic Medicine, Royal Adelaide Hospital, South Australia.
The American Review of Respiratory Disease
|November 1, 1991
Summary
Severe sleep fragmentation did not significantly alter ventilatory chemoresponsiveness in healthy adults. This suggests sleep fragmentation alone is unlikely to cause respiratory failure in conditions like obstructive sleep apnea syndrome.
Area of Science:
- Respiratory Physiology
- Sleep Medicine
Background:
- Sleep disruption is hypothesized to affect ventilatory control, potentially contributing to respiratory failure in obstructive sleep apnea syndrome (OSAS).
- Previous studies showed reduced chemoresponsiveness after total sleep deprivation, but OSAS patients typically experience sleep fragmentation.
Purpose of the Study:
- To investigate the impact of severe sleep fragmentation on hypercapnic ventilatory responsiveness (HCVR) in healthy individuals.
- To determine if sleep fragmentation, mimicking conditions in OSAS patients, affects respiratory control.
Main Methods:
- 13 healthy males underwent two consecutive nights of severe sleep fragmentation (arousal every minute) and normal sleep, in a randomized crossover design.
- Hypercapnic ventilatory responsiveness (HCVR) and spirometry were measured after each condition.
- Interventions were separated by one week.
Main Results:
- No significant differences were found in the slope or position of the hypercapnic ventilatory responsiveness (HCVR) curve after sleep fragmentation compared to normal sleep.
- Forced expiratory volumes also remained unchanged.
Conclusions:
- Two nights of severe sleep fragmentation do not appear to significantly impair ventilatory chemoresponsiveness in healthy young males.
- Sleep fragmentation is unlikely to be a primary cause of progressive respiratory failure in patients with OSAS or other respiratory disorders, though prolonged fragmentation effects remain possible.