Relation of overactive bladder with motor symptoms and dopamine transporter imaging in drug-naïve Parkinson's disease.

Objectives: The aim of the present study was to determine the relation of urinary dysfunction with motor symptoms and nigrostriatal neuron loss in drug-naïve patients with Parkinson's disease (PD). We therefore examined the relation of overactive bladder (OAB) symptoms with motor symptoms and striatal dopamine transporter (DAT) binding measured by [123-Iodine]-fluoropropyl-2beta-carbomethoxy-3beta-(4-iodophenylnortropane) dopamine transporter single-photon emission computed tomography ( ¹²³ I-FP-CIT SPECT).
Patients and Methods: Thirty-one untreated PD patients (12 men and 19 women with a mean age of 71.2 ± 6.7 years) were included in this study. Patients were evaluated with overactive bladder symptom score (OABSS) and divided into an OAB group and Non-OAB group. They underwent clinical assessments and ¹²³ I-FP-CIT SPECT imaging. Motor symptoms were assessed using Unified Parkinson's Disease Rating Scale (UPDRS).
Results: The results showed that UPDRS motor score (p = 0.01) and akinetic-rigid score (p = 0.002) were higher and that striatal DAT availability (p = 0.01) was lower in the OAB group than in the Non-OAB group. However, tremor score, age, and duration of PD showed no significant differences between the OAB group and Non-OAB group.
Conclusions: Urinary dysfunction in untreated PD is related with increase in motor symptoms (especially bradykinesia and axial symptoms) and reduction of striatal DAT availability.
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