Parkinson Disease Clinical Trial
Official title:
Neural Correlates of Impulsivity in Idiopathic REM Sleep Behavior Disorder: a Functional Magnetic Resonance Imaging Case-control Study
This study aims to investigate the neural correlates (structural changes, functional connectivity, and structural connectivity of brain structures in prefrontal cortex and basal ganglia) of impulsivity by measuring structures and the blood-oxygen-level-dependent signal of brain in response to impulsive tasks and task-free using functional Magnetic Resonance Image method among healthy controls, patient with prodromal PD (iRBD), and patients with PD.
Background: Excessive impulsivity is an important non-motor symptom of Parkinson's disease (PD), especially for those on dopamine agonist treatment. Dopaminergic dysfunction has been highly correlated with impulsivity. Given that idiopathic REM sleep behavior disorder (iRBD) is a prodromal stage of alpha-synucleinopathy, such as PD, the dysfunction of dopaminergic system at this early stage may also precipitate alternation of impulsivity. Hypothesis and objectives: iRBD may have altered impulsivity which is similar to that found in de novo PD and may serve as a biomarker in differentiating iRBD from healthy controls. This study aims to investigate the neural correlates (structural changes, functional connectivity, and structural connectivity of brain structures in prefrontal cortex and basal ganglia) of impulsivity by measuring structures and the blood-oxygen-level-dependent signal of brain in response to impulsive tasks and task-free using functional Magnetic Resonance Image method among healthy controls, patient with prodromal PD (iRBD), and patients with PD. Design and subjects: This is a case-control study that will recruit 96 subjects (24 healthy controls, 24 patients with iRBD, 24 PD patients on dopaminergic medication and 24 PD patients who are not on dopaminergic medication). Main outcome measures: 1) The difference in brain activity in response to impulsivity tasks between groups; 2) The difference in structure volume, structural and functional connectivity of region of interest related to impulsivity (prefrontal cortex and basal ganglia) between groups; 3) The association of these changes with the stage of disease from healthy, to prodromal, and to clinically diagnosed PD. ;
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