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Sleep apnea in patients with myasthenia gravis

To assess the prevalence of obstructive sleep apnea (OSA) in myasthenia gravis, the authors identified patients at risk of OSA using the multivariable apnea prediction index. OSA was diagnosed with polysomnography. The prevalence of OSA was 36% compared to an expected prevalence of 15 to 20% in the general population. When including the presence of daytime sleepiness (OSA syndrome), the prevalence was 11% compared to 3% in the general population.