Longitudinal Assessment of Parkinson's Motor Symptoms and Dopaminergic Dysfunction Patterns Using DaTSCAN

Area of Science:

• Neurology
• Radiology
• Neuroimaging

Background:

• Parkinson's disease (PD) staging and severity impact treatment decisions.
• Dopamine transporter scan (DaTSCAN) is effective for PD diagnosis, but its predictive role for motor function and symptom progression is debated.

Purpose of the Study:

• To assess the relationship between motor symptom patterns in Parkinson's disease and DaTSCAN findings.
• To explore DaTSCAN's utility in predicting motor dysfunction and disease severity.

Main Methods:

• 196 PD patients were analyzed, categorized by tremor, postural instability/gait difficulty (PIGD), and dyskinesia.
• Multivariate and logistic regression models examined associations between two-year motor symptom scores and DaTSCAN patterns.

Main Results:

• Lower DaTSCAN uptake was observed in patients with dyskinesia, especially in the right caudate and left putamen.
• DaTSCAN values strongly correlated with overall PD severity and Activities of Daily Living (ADL) scores.
• DaTSCAN measures negatively correlated with motor scores (MDS-UPDRS III, II, PIGD) but did not predict tremor-dominant scores.

Conclusions:

• DaTSCAN provides valuable information on PD disease severity and motor dysfunction, particularly postural instability and gait disturbance.
• Findings suggest DaTSCAN's utility extends beyond diagnosis to assessing specific motor deficits in Parkinson's disease.