[Associations between objective sleepiness and cognition function before and after CPAP in obstructive sleep apnea...

Area of Science:

• Neurology
• Sleep Medicine
• Pulmonology

Background:

• Obstructive sleep apnea (OSA) is a common sleep disorder characterized by repeated episodes of airway obstruction during sleep.
• OSA significantly impacts neurocognitive function, leading to daytime sleepiness and impaired attention.
• Continuous positive airway pressure (CPAP) is the primary treatment for OSA, aiming to alleviate symptoms and improve quality of life.

Purpose of the Study:

• To investigate the relationship between objective sleepiness measures and neurocognitive performance in OSA patients before and after CPAP treatment.
• To assess the impact of CPAP therapy on sleep architecture and daytime alertness.

Main Methods:

• A cohort of 53 patients with moderate-to-severe OSA underwent polysomnography (PSG), multiple sleep latency test (MSLT), and psychomotor vigilance test (PVT) at baseline and after CPAP therapy.
• Sleep parameters, including apnea-hypopnea index (AHI), and sleep stage percentages were analyzed.
• Changes in MSLT (mean sleep latency) and PVT metrics (reaction time, lapses) were compared before and after CPAP treatment.

Main Results:

• CPAP therapy significantly reduced AHI and increased non-REM stage 3 and REM sleep.
• Patients showed improved PVT performance, including shortened reaction times and reduced lapses, after CPAP.
• Mean sleep latency (MSL) increased significantly after CPAP therapy.
• Changes in MSL were not significantly correlated with changes in PVT performance.

Conclusions:

• CPAP therapy effectively improves sleep quality and objective measures of alertness in OSA patients.
• While CPAP improves neurocognitive function as measured by PVT, the change in MSL does not directly correlate with these improvements.
• MSLT and PVT may assess distinct aspects of cognitive function related to sleepiness.