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Exploring the Arousal Intensity in Patients with Obstructive Sleep Apnea: Based on Odds Ratio Product.

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A novel measure, odds ratio product (ORP), quantifies arousal intensity in obstructive sleep apnea (OSA). Higher arousal intensity correlates with longer events and daytime sleepiness, offering a new biomarker for OSA.

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Area of Science:

  • Sleep Medicine
  • Neurophysiology
  • Biomarkers

Background:

  • Obstructive sleep apnea (OSA) involves repeated airway collapse during sleep, causing cortical arousals.
  • Current arousal metrics are insufficient for capturing arousal response heterogeneity and clinical significance.
  • The odds ratio product (ORP) offers a continuous electroencephalographic measure of sleep depth and potential arousal intensity.

Purpose of the Study:

  • To quantify arousal intensity in untreated OSA patients using ORP.
  • To investigate relationships between arousal intensity, respiratory event features, and subjective sleepiness.

Main Methods:

  • Retrospective analysis of 1057 untreated OSA patients from the APPLES cohort.
  • Calculation of arousal intensity using EEG spectral power mapped to ORP deviations from baseline.
  • Mixed-effects modeling and stepwise multiple regression to analyze influencing factors and associations with sleepiness.

Main Results:

  • Arousal intensity increased with respiratory event duration, being higher for apneas than hypopneas.
  • Deep sleep and lateral posture reduced arousal response; significant inter-individual variability was observed.
  • Higher baseline arousal intensity independently predicted increased subjective daytime sleepiness.

Conclusions:

  • ORP-derived arousal intensity is a quantitative biomarker for cortical arousal in OSA.
  • Arousal intensity is influenced by respiratory events, sleep architecture, and individual factors.
  • Arousal intensity shows an independent association with subjective daytime sleepiness.