Ventilatory instability during sleep onset in individuals with high peripheral chemosensitivity

Area of Science:

• Physiology
• Sleep Science
• Respiratory Control

Background:

• State-related ventilatory fluctuations amplify during sleep onset.
• Peripheral chemoreceptor activity contributes to this amplification, as shown by hyperoxia effects.
• Intersubject variability in amplification magnitude suggests differing peripheral chemoreceptor drive (PCD).

Purpose of the Study:

• To investigate if individual differences in peripheral chemoreceptor drive (PCD) explain variability in sleep-onset ventilatory amplification.
• To determine the impact of high versus low PCD on ventilatory instability during sleep onset.

Main Methods:

• Measured state-related ventilatory fluctuations during sleep onset in normoxia and hyperoxia.
• Grouped subjects into high and low peripheral chemoreceptor drive (PCD) categories.
• Compared amplification magnitude between high-PCD and low-PCD groups under both conditions.

Main Results:

• High-PCD subjects exhibited significantly greater amplification of ventilatory fluctuations than low-PCD subjects.
• Hyperoxia markedly reduced amplification in high-PCD individuals.
• Hyperoxia had minimal effect on amplification in low-PCD individuals.

Conclusions:

• Individual differences in peripheral chemoreceptor drive (PCD) significantly influence sleep-onset ventilatory instability.
• High PCD is associated with greater sleep-related breathing fluctuations.
• Peripheral chemoreceptor activity plays a role in the pathophysiology of sleep-disordered breathing.