Tremor and clinical fluctuation are related to sleep disorders in Chinese patients with Parkinson's disease.

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ObjectiveTo study the relationship between sleep disturbances and symptoms in patients with Parkinson's disease (PD).MethodsThe Parkinson's Disease Sleep Scale-Chinese Version (PDSS-CV) was used to evaluate the sleep disturbances of PD patients in a cross sectional study. The Unified Parkinson's Disease Rating Scale (UPDRS) parts II-IV, and the Hoehn & Yahr (H&Y) stage were used to determine the level of motor function in PD and the severity of PD. The Spearman correlation and a multiple regression analysis were used to identify the relationship between sleep disturbances and symptoms of PD. The quantities derived from the UPDRS and the H&Y stage and disease duration were compared between groups of patients either with or without sleep disturbances identified by the PDSS. This study was conducted from December 2011 to March 2012 at the First Affiliated Hospital of Sun Yat-sen University, in Guangzhou.ResultsA total of 136 PD patients were included in this study. The overall total PDSS score in PD patients was 107.58 ± 23.35 points (range: 30-146). There were significant differences in the disease duration, the H&Y stage, and the UPDRS section subscores between groups of patients either with or without sleep disturbances (Kruskal-Wallis Test, p ConclusionsThe level of daily life activity and the occurrences of tremor and clinical fluctuation are likely to be important factors that lead to PD patients' sleep disturbances. This study may elucidate an important clue for the relationship between sleep disturbances and PD symptoms.

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