- •Burden of non-motor symptoms is similar in Parkinson's disease and parkinsonism with normal brain dopamine function
- •Total burden of non-motor symptoms may not be used in differential diagnosis between Parkinson's disease and non-dopaminergic parkinsonism
- •Total non-motor symptom burden does not correlate with striatal brain dopamine transporter binding in patients with Parkinson's disease
Non-motor symptoms (NMSs) are clearly more prevalent in Parkinson's disease (PD) patients compared to healthy individuals. However, NMSs are also common in the elderly and other neurological conditions, and thus, it is not known whether NMSs could be used to differentiate PD from parkinsonism/tremor without dopamine deficiency.
We prospectively evaluated NMSs immediately before brain dopamine transporter (DAT) [123I]FP-CIT SPECT scanning in 193 patients with unclear parkinsonism/tremor. According to the clinical follow-up and imaging results, 84 patients had PD. NMSs and their correlations with striatal DAT binding were investigated in PD patients and in parkinsonism/tremor patients with normal dopamine function.
Total NMS burden, anxiety or depression did not differ between PD patients and patients with normal DAT binding. DAT-normal patients reported more perception-related (p = 0.045) and attention/memory-related NMSs than PD patients (p < 0.001). Total NMS score did not correlate with striatal DAT binding in either group.
In clinically uncertain cases, the total NMS burden cannot be used as a tool in distinguishing PD patients from patients with non-dopaminergic parkinsonism/tremor. Clinical screening of NMSs appears equally important in all patients with parkinsonism.
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Published online: July 19, 2019
Accepted: July 18, 2019
Received in revised form: June 20, 2019
Received: April 3, 2019
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