Abstract
REM sleep behavior disorder (RBD) is a sleep disorder characterized by loss of normal voluntary muscle atonia during REM sleep associated with complex motor behavior while dreaming. Dream-enacting behaviors can also occur in patients with other sleep disorders such as obstructive sleep apnea (OSA). This clinical situation has been termed âpseudo-RBDâ. In contrast, OSA causes frequent arousal, which may consequently result in masking of RBD symptoms. We reported two patients with severe OSA, who were initially diagnosed with âpseudo-RBDâ but on continuous positive airway pressure (CPAP) titration, rediagnosed with âtrue-RBDâ. When RBD is clinically suspected but is not confirmed by diagnostic overnight polysomnography, we have to keep in mind that RBD could be detected during CPAP titration. Keywords: REM sleep behavior disorder, Pseudo-REM sleep behavior disorder, Obstructive sleep apnea, REM sleep without atonia
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