Abstract
Study Objective
Neurophysiological activity during wake and sleep states in obesity hypoventilation (OHS) and its relationship with neurocognitive function is not well understood. This study compared OHS with equally obese obstructive sleep apnea (OSA) patients, with similar apnea-hypopnea indices.
Methods
Resting wake and overnight sleep electroencephalography (EEG) recordings, neurocognitive tests, and sleepiness, depression and anxiety scores were assessed before and after 3 months of positive airway pressure (PAP) therapy in 15 OHS and 36 OSA patients.
Results
Pretreatment, greater slow frequency EEG activity during wake and sleep states (increased delta-alpha ratio during sleep, and theta power during awake) was observed in the OHS group compared to the OSA group. EEG slowing was correlated with poorer performance on the psychomotor vigilance task (slowest 10% of reciprocal reaction times, psychomotor vigilance test [PVT SRRT], primary outcome), and worse sleep-related hypoxemia measures in OHS. There was no between-group significant difference in PVT performance at pre or post-treatment. Similarly, despite both groups demonstrating improved sleepiness, anxiety and depression scores with PAP therapy, there were no differences in treatment response between the OSA and OHS groups.
Conclusion
Patients with OHS have greater slow frequency EEG activity during sleep and wake than equally obese patients with OSA. Greater EEG slowing was associated with worse vigilance and lower oxygenation during sleep.
Clinical Trial
This trial was registered with the Australian and New Zealand Clinical Trials Registry (ACTRN12615000122550).
Neurophysiological activity during wake and sleep states in obesity hypoventilation (OHS) and its relationship with neurocognitive function is not well understood. This study compared OHS with equally obese obstructive sleep apnea (OSA) patients, with similar apnea-hypopnea indices.
Methods
Resting wake and overnight sleep electroencephalography (EEG) recordings, neurocognitive tests, and sleepiness, depression and anxiety scores were assessed before and after 3 months of positive airway pressure (PAP) therapy in 15 OHS and 36 OSA patients.
Results
Pretreatment, greater slow frequency EEG activity during wake and sleep states (increased delta-alpha ratio during sleep, and theta power during awake) was observed in the OHS group compared to the OSA group. EEG slowing was correlated with poorer performance on the psychomotor vigilance task (slowest 10% of reciprocal reaction times, psychomotor vigilance test [PVT SRRT], primary outcome), and worse sleep-related hypoxemia measures in OHS. There was no between-group significant difference in PVT performance at pre or post-treatment. Similarly, despite both groups demonstrating improved sleepiness, anxiety and depression scores with PAP therapy, there were no differences in treatment response between the OSA and OHS groups.
Conclusion
Patients with OHS have greater slow frequency EEG activity during sleep and wake than equally obese patients with OSA. Greater EEG slowing was associated with worse vigilance and lower oxygenation during sleep.
Clinical Trial
This trial was registered with the Australian and New Zealand Clinical Trials Registry (ACTRN12615000122550).
| Original language | English |
|---|---|
| Article number | zsz214 |
| Pages (from-to) | 1-9 |
| Number of pages | 9 |
| Journal | Sleep |
| Volume | 43 |
| Issue number | 2 |
| DOIs | |
| Publication status | Published - 13 Feb 2020 |
| Externally published | Yes |
Keywords
- delta-alpha ratio
- quantitative electroencephalogram
- obstructive sleep apnea
- wake and sleep
- oxygen saturation