An Open-Label Feasibility/Pilot Study With [123I]-IBZM SPECT (DOPA-SYN)

Phase 2

Completed

• Conditions: Parkinson's Disease

• Registration Number: NCT00200447
• Lead Sponsor: Molecular NeuroImaging

Brief Summary

This study conducted to more fully evaluate the way that carbidopa/levodopa and entacapone may work in the brain. This research study uses \[123I\]-IBZM and dynamic SPECT imaging to determine the amount and the duration of dopamine release from specific regions in the brain after treatment with either the combination of carbidopa/levodopa or the combination of carbidopa/levodopa/entacapone.

Detailed Description

This is a pilot evaluation of dopaminergic function in PD using a bolus plus constant infusion protocol with \[123I\]-IBZM and SPECT to evaluate the potential for carbidopa/l-dopa alone or carbidopa/l-dopa/entacapone to produce displacement of striatal radioactivity for assessment of intrasynaptic dopamine. We will assess the feasibility of this paradigm for detecting l-dopa effects on the SPECT signal in subjects with PD with disease duration of greater than 4yrs and with a stable response to L-dopa. Each subject will undergo three \[123I\]-IBZM studies separated by 1-2 weeks. Subjects will be off medication for at least 12 h prior to study For each of the three scan days patients will receive a constant intravenous infusion of \[123I\]-IBZM over 4-5 hours to establish an equilibrium binding condition of the radiotracer at striatal D2/D3 receptors. Three baseline SPECT acquisitions will be obtained prior to medication dosing to establish a stable baseline. At approximately 5 h after the initiation of the infusion subjects will receive a single oral dose of either carbidopa/levodopa (37.5mg/150mg or 50mg/250mg), or carbidopa/levodopa/entacapone (either 37.5mg/150mg/200mg- STALEVO or 50/250mg/200mg).

Study Timeline

• Study Start: 2004-03
• Primary Completion: 2004-09
• Study Completion: 2004-09
• Study First Submitted: 2005-09-12
• Study First Submitted QC: 2005-09-12
• Study First Posted: 2005-09-20
• Status Verified: 2008-01
• Last Update Submitted: 2008-01-17
• Last Update Posted: 2008-01-21

Recruitment & Eligibility

• Status: COMPLETED
• Sex: All
• Target Recruitment: 3

Inclusion Criteria

Not provided

Exclusion Criteria

Not provided

Study & Design

• Study Type: INTERVENTIONAL
• Study Design: CROSSOVER

Primary Outcome Measures

Name	Time	Method
The primary outcome will be the reduction from baseline in IBZM striatal uptake during a 6-8 hour assessment period after treatment.	6-8hrs

Secondary Outcome Measures

Name	Time	Method
Secondary Measures include: Putamen and caudate uptake over time, UPDRS scores, and Pharmacokinetic analysis.	6-8hrs