Utility of a newly created questionnaire on subtle motor symptoms in high-risk subjects with Parkinson's disease

BackgroundProdromes of Parkinson's disease (PD) include both motor and non-motor symptoms. Although questionnaires have been established for non-motor symptoms, no quantitative self-assessment tool has been developed to assess subtle motor symptoms during the prodromal stage.ObjectiveTo develop a self-administered questionnaire to assess subtle motor symptoms during the prodromal stage.MethodsWe created the Screening Questionnaire for Subtle Parkinsonism (SQSP). The SQSP and questionnaires on non-motor symptoms were collected from health checkup examinees. Individuals with ≥ 2 non-motor symptoms, including autonomic dysfunction, hyposmia, and REM sleep behavior disorder, were classified as high-risk, while those without these symptoms were low-risk. We also conducted comprehensive evaluations, including neurological examinations and imaging tests, on 30 patients with PD, 71 high-risk, and 24 low-risk subjects.ResultsAmong 1183 health checkup examinees, high-risk subjects had higher SQSP scores than low-risk (9 [4-15] vs. 3 [1-6]). Patients with PD had the highest SQSP scores, followed by high-risk subjects and then low-risk. SQSP scores correlated with MDS-UPDRS II and III scores and specific binding ratios of DaT-SPECT. High-risk subjects with abnormal DaT-SPECT had higher SQSP scores than those with normal imaging (9 [7-19] vs. 5.5 [2-10]). Although 26 of the 71 high-risk and 23 of the 24 low-risk subjects scored zero on the MDS-UPDRS II, most high-risk and half low-risk subjects had SQSP scores above zero.ConclusionsThe SQSP was deemed effective for assessing subtle motor symptoms during the prodromal stage of PD and identifying prodromal PD cases within the general population.