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Background  Isolated REM sleep without atonia (RSWA) as a main polysomnograhic feature of REM sleep behaviour disorder (RBD) is thought to be a prodromal or subclinical state of the disease. RSWA/RBD occurence in psychiatric population is much more frequent than in general population but its associated factors are still not known.    Methods  We invited 88 psychiatry in-patients to undervent video-polysomnography. The visual scoring was focused on RSWA in submentales and flexores digitales superficiales muscles. This parametr was subsequently correlated mainly with age/gender, their medication and mental status.    Results  The RWSA was mostly still in normal range despite the fact, that selected psychiatry patients (≤ 50 years) were taking several classes of psychoactive medication. 3,6% had convincingly RBD, although 35.7% reported rare lifetime occurence of dream-enacting behaviour and 62.8% sporadic nightmares. We found correlation between RSWA and SNRI medication class ( p  = 0.015), specifically venlafaxine ( p  = 0.029) as well as quetiapine ( p  = 0.030). Another significant associated factors were current anxiety ( p  < 0.001) and depressive symptoms ( p  = 0.05), but we found no relation between RSWA and given diagnosis.    Conlucions  Isolated RSWA in younger psychiatry patients might be a result of multiple factors, including medication and current mental status but these factors are in most cases not sufficient to manifest RBD.

Associated factors of REM sleep without atonia in younger (≤ 50 years) hospitalized psychiatric patients