The impact of non-motor symptoms on health-related quality of life of patients with Parkinson's disease

Martinez-Martin, Pablo, Rodriguez-Blazquez, Carmen, Kurtis, Monica M., Chaudhuri, K. Ray, NMSS Validation Group, ... and Naidu, Yogini (2011) The impact of non-motor symptoms on health-related quality of life of patients with Parkinson's disease. Movement Disorders, 26(3), pp. 399-406. ISSN (print) 0885-3185

Official URL: https://doi.org/10.1002/mds.23462

Abstract

Background: Non-motor symptoms are detrimental to health-related quality of life (HRQoL) of Parkinson’s disease patients. In this study, the Non-Motor Symptoms Scale (NMSS) was used to assess the impact of the non-motor symptoms on HRQoL of Parkinson’s disease patients. Methods: In a multicenter, international, cross sectional study on 411 Parkinson’s disease patients, the NMSS was applied along with clinical (Hoehn and Yahr staging and SCOPA-Motor) and HRQoL measures (PDQ-39, and EQ 5D). The association of NMSS and SCOPA-Motor with HRQoL measures and the differences in HRQoL scores between patients with and without non-motor symptoms in each NMSS domain were estimated by non-parametric statistics. Predictors of HRQoL were sought through multiple linear regression analyses. Results: Nocturia (68.4% of the sample), fatigue (65.9%), and dribbling saliva (56.7%), were the most frequent complaints. Total NMSS score: (1) showed a higher correlation coefficient (rS 5 0.70) with the PDQ-39 Summary Index (SI) than SCOPA-Motor (rS 5 0.58); (2) showed high-moderate correlation (rS 5 0.60 2 0.38) with all PDQ-39 domains; and (3) was the best predictor of HRQoL as measured by the PDQ-39 SI. For each NMSS domain, patients with symptoms had significantly worse HRQoL scores than patients without symptoms. Discussion: To our knowledge, this is the first study to determine in a holistic manner the impact of the non-motor symptoms on HRQoL of Parkinson’s disease patients. The results show that non-motor symptoms have, as a whole, a greater impact on HRQoL than motor symptoms and non-motor symptoms progression contributes importantly to HRQoL decline in patients with Parkinson’s disease.

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