Related Experiment Videos
Ventilatory response to induced auditory arousals during NREM sleep
1William S. Middleton Memorial Veterans Hospital, Department of Medicine, University of Wisconsin Medical School, Madison, USA.
Sleep
|December 24, 1997
Summary
Auditory stimuli can cause temporary breathing increases during sleep, but only if they trigger a cortical arousal. This arousal-induced hyperpnea in normal subjects did not lead to subsequent apnea or hypopnea.
Area of Science:
- Sleep Medicine
- Neuroscience
- Respiratory Physiology
Background:
- Sleep state instability is a proposed mechanism for central sleep apnea/hypopnea during non-rapid eye movement (NREM) sleep.
- Understanding arousal's role in breathing regulation during sleep is crucial for sleep disorder research.
Purpose of the Study:
- To investigate if induced cortical arousals during stable NREM sleep influence breathing patterns.
- To determine if arousal-induced hyperpnea leads to subsequent hypopnea or apnea in healthy individuals.
Main Methods:
- Eight healthy subjects underwent NREM sleep.
- Transient auditory stimuli were used to induce brief cortical arousals, assessed by American Sleep Disorders Association (ASDA) criteria.
- Minute ventilation (VE) was measured before and after auditory stimuli.
Main Results:
- Cortical arousal occurred in 59 of 96 trials.
- Arousal was associated with a significant increase in minute ventilation on the first post-stimulus breath (5.1 to 7.5 L/min).
- No hypopnea or apnea followed arousal-induced hyperpnea; ventilation returned to baseline levels within five breaths.
Conclusions:
- Auditory stimulation causes transient hyperpnea only when associated with cortical arousal.
- Arousal-induced hyperpnea does not precipitate hypopnea or apnea in normal subjects.
- Further research is needed to explore factors like chemical stimuli or upper airway resistance in arousal-related sleep-disordered breathing.