Postural sway correlates with cognition and quality of life in Parkinson’s disease

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Main idea: Patients with Parkinson’s disease can be diagnosed through posture sway which makes diagnostics easier.

Abstract 

The severity of Parkinson’s disease (PD) is difficult to assess objectively owing to the lack of a robust biological marker of underlying disease status. The current standard tool is the Unified Parkinson’s Disease Rating Scale (MDS-UPDRS). Postural sway has been shown to correlate with complex brain functioning in other conditions. This study aimed to investigate the relationship between postural sway, MDS-UPDRS and other non-motor measures of disease severity in patients with PD. 25 patients with PD and 18 age-matched controls participated in the study. All participants underwent assessment of postural sway using a force plate, with eyes open and closed. Participants underwent tests of cognition and quality of life: Montreal Cognitive Assessment (MoCA), Neuropsychiatry Unit Cognitive Assessment (NUCOG), and, for the patients, the Parkinson’s Disease Questionnaire (PDQ-39-1), and assessment of clinical status using the motor component of the MDS-UPDRS. Patients swayed significantly more than controls. This was most obvious in the eyes-closed condition. Sway path length showed strong correlations with PDQ-39-1, MoCA, and the verbal fluency component of the NUCOG, and, to a lesser degree, with the UPDRS-III in patients with PD. These results suggest that motor and non-motor symptoms of PD are associated in patients, and that postural sway shows potential as a possible measure of underlying disease status in PD.

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