Study of the Effects of Dopaminergic Medications on Dopamine Transporter Imaging in Parkinson's Disease

Parkinson Disease Clinical Trial

Official title: Investigating Effects of Short-term Treatment With Pramipexole or Levodopa on [123I]B-CIT and SPECT Imaging in Early Parkinson's

Status Completed

Clinical Trial Summary

Study participants who have been clinically diagnosed with Parkinson disease will receive no treatment, treatment with either levodopa, or treatment with Mirapex for a period of 12 weeks. Over the course of the study subjects will travel to the Institute for Neurodegenerative Disorders (IND) in New Haven, Connecticut for brain imaging.

Clinical Trial Description

Brain imaging will be conducted three times during this study. Study participants will travel to IND for [123I]ß-CIT and SPECT imaging (scan 1). Subjects will be randomized to no treatment, treatment with either levodopa, or treatment with Mirapex and undergo treatment for a period of 12 weeks. Subjects will return to IND for [123I]ß-CIT and SPECT imaging (scan 2) after 12 weeks of treatment and withdraw from the medication following the scan. Eight to 12 weeks after medication withdrawal, a final [123I]ß-CIT and SPECT imaging study (scan 3) will be performed at IND. The imaging outcome, striatal uptake of [123I]ß-CIT, from scan 1 (untreated) and scan 2 (treated with levodopa or pramipexole) will be compared to determine if there is a significant change in the uptake of the marker that may be attributed to levodopa or pramipexole treatment. In addition, scan 3 will be compared to scan 2 to determine the duration and reversibility of any regulatory effect that occurs. The subjects will be randomized, but not blinded to study drug assignment. The imaging technologist and all imaging analyses will be performed by investigators blinded to study drug assignment. ;

Study Design

Allocation: Randomized, Endpoint Classification: Safety/Efficacy Study, Intervention Model: Single Group Assignment, Masking: Single Blind, Primary Purpose: Diagnostic

Related Conditions & MeSH terms

• Parkinson Disease
• Parkinsonian Syndrome

• NCT number: NCT00096720
• Study type: Interventional
• Source: Institute for Neurodegenerative Disorders
• Status: Completed
• Phase: Phase 2
• Start date: February 2004
• Completion date: May 2007