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Modeling hypersomnolence in sleep-disordered breathing. A novel approach using survival analysis
N M Punjabi1, D J O'hearn, D N Neubauer
1Division of Pulmonary and Critical Care Medicine and Department of Psychiatry, Johns Hopkins University and School of Medicine, Johns Hopkins University School of Public Health and Hygiene, Baltimore, MD, USA. naresh@welchlink.welch.jhu.edu
Summary
Excessive daytime sleepiness in sleep-disordered breathing (SDB) is linked to apnea-hypopnea index (AHI), nocturnal hypoxemia, and sleep fragmentation. These factors independently predict hypersomnolence in SDB patients.
Area of Science:
- Sleep Medicine
- Pulmonology
- Neurology
Background:
- Excessive daytime sleepiness (EDS) is a common symptom in patients with sleep-disordered breathing (SDB), but its precise causes remain unclear.
- Understanding the determinants of hypersomnolence is crucial for effective management of SDB.
Purpose of the Study:
- To investigate the relationships between clinical and polysomnographic parameters and the degree of hypersomnolence in a large cohort of SDB patients.
- To identify independent predictors of excessive daytime sleepiness in individuals with moderate to severe SDB.
Main Methods:
- A cohort of 741 obese patients with SDB (apnea-hypopnea index [AHI] >/= 10 events/h) was studied.
- Hypersomnolence was assessed using the multiple sleep latency test (MSLT).
- Multivariate proportional hazards models and survival analysis were employed to identify risk factors.
Main Results:
- The apnea-hypopnea index (AHI) and nocturnal hypoxemia were identified as independent predictors of hypersomnolence (MSLT < 10 min).
- Increased severity of AHI and oxyhemoglobin desaturation (DeltaSaO2) correlated with higher relative risks of hypersomnolence.
- Sleep fragmentation, characterized by altered sleep stage distribution, also independently predicted hypersomnolence, with increased stage 2 and slow wave sleep (SWS) showing protective effects.
Conclusions:
- Apnea-hypopnea index (AHI), nocturnal hypoxemia, and sleep fragmentation are significant independent determinants of excessive daytime sleepiness in patients with sleep-disordered breathing.
- These findings highlight the multifactorial nature of hypersomnolence in SDB and emphasize the importance of addressing these specific parameters in clinical practice.