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Sleep apnea and cognitive dysfunction in myasthenia gravis
R Stepansky1, G Weber, J Zeitlhofer
1Neurological University Clinic Vienna, Austria.
Acta Medica Austriaca
|January 1, 1997
Summary
Myasthenia gravis patients often experience REM-sleep breathing issues and impaired memory. Sleep apnea in these patients is linked to worse memory function, suggesting a connection between respiratory problems and cognitive decline.
Area of Science:
- Neurology
- Sleep Medicine
- Cognitive Science
Background:
- Myasthenia gravis (MG) is an autoimmune disorder affecting neuromuscular junctions.
- Cognitive dysfunction and sleep disturbances are reported in MG patients.
- The underlying causes, whether central nervous system (CNS) involvement or respiratory issues, remain unclear.
Purpose of the Study:
- To investigate the relationship between cognitive dysfunction, REM-sleep disturbances, and nocturnal respiratory problems in myasthenia gravis.
- To determine if CNS involvement or sleep-related respiratory issues contribute to cognitive deficits in MG.
Main Methods:
- Overnight polysomnography was performed on 19 middle-aged patients with MG and 10 matched controls.
- Neuropsychological testing assessed vigilance and memory functions.
- Sleep data and cognitive performance were analyzed in relation to MG status and presence of sleep apnea.
Main Results:
- 60% of MG patients exhibited central sleep apnea/hypopnea with oxygen desaturation during REM sleep, without reducing REM sleep duration.
- MG patients showed normal vigilance but impaired memory function compared to controls.
- Myasthenic patients with sleep apnea demonstrated significantly poorer memory function than those without sleep apnea.
Conclusions:
- Nocturnal central respiratory events during REM sleep are common in MG patients.
- Impaired memory function in MG is associated with the presence of sleep apnea.
- These findings suggest that sleep-disordered breathing may contribute to cognitive deficits in myasthenia gravis.