Prevalence of non-motor disorders in Parkinson`s disease

(1) Background: to reveal the prevalence of non-motor disorders in Parkinson’s disease (PD), we analyzed both Russian and international studies on the issue of PD-associated non-motor disorders in Caucasian patients; (2) Methods: We have carried out a search for full-text Englishand Russian-language articles published during the last ten years (from 2010 to 2020) in PubMed, Scopus, Web of Science, Springer, Clinical case, and E-library databases using multiple versions of keywords and their combinations. (3) Results: General prevalence of PD-associated non-motor disorders proved to be high. At the same time, we did not find significant differences between the prevalence of cognitive, affective, or behavioral disorders in PD patients. However, depression was found to be more common in PD patients in the Russian Federation; (4) Conclusions: According to the results of our review, cognitive and affective disorders in PD represent the issues of major concern.