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Sponsored by: |
National Institute of Neurological Disorders and Stroke (NINDS) |
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Information provided by: | National Institutes of Health Clinical Center (CC) |
ClinicalTrials.gov Identifier: | NCT00058721 |
This study will use single photon emission computed tomography, or SPECT (see below), to examine brain nicotine receptors in evaluating the role of a chemical called acetylcholine in memory and other problems in Parkinson's disease (PD). Acetylcholine acts by binding to these nicotine receptors.
Healthy normal volunteers and patients with Parkinson's disease 40 years of age and older, with or without dementia, may be eligible for this study. Candidates will be screened with physical and neurological examinations, a pen and paper test of memory and other mental functions, blood tests, and, for women of childbearing potential, a pregnancy test. Patients with cognition problems will have more intensive mental function tests.
All participants will undergo the following procedures:
Condition | Intervention |
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Parkinson Disease |
Drug: I-123-5-IA85380 |
Study Type: | Observational |
Official Title: | SPECT Evaluation of Nicotinic Cholinergic Receptors in Parkinson's Disease |
Estimated Enrollment: | 60 |
Study Start Date: | April 2003 |
Estimated Study Completion Date: | January 2005 |
Parkinson's disease (PD) is the second most common neurodegenerative disorder. PD is characterized primarily by motor impairment, but cognitive impairment is common and dementia may occur in up to 50% of patients. Cholinergic deficits have been widely demonstrated in PD patients with and without dementia. Cholinergic deficits are more profound in the setting of PD with dementia. The cholinergic system mediates aspects of learning and memory and deficits in cholinergic function are correlated with the degree of dementia in PD. Additionally, the cholinergic system may mediate certain aspects of motor function in PD. Data on cholinergic function, particularly relating to nicotinic cholinergic receptors, are limited to post mortem studies, and little is known about the role of the cholinergic system in vivo and how it relates to clinical phenomena. The aim of the current study is to assess the feasibility and usefulness of imaging of the high affinity alpha 4 beta 2 nicotinic cholinergic receptor in vivo, using SPECT (single photon emission computed tomography) imaging in patients with PD. The long-term goal of the present study is to further understanding of the role of the cholinergic system in the pathogenesis of PD and to elucidate potential diagnostic and therapeutic targets.
Genders Eligible for Study: | Both |
Accepts Healthy Volunteers: | Yes |
INCLUSION CRITERIA -Patients:
Age greater than or equal to 40.
Diagnosis of PD.
Consent.
Responsible Caregiver (only for patients with dementia).
INCLUSION CRITERIA - Controls:
Age greater than or equal to 40.
Consent.
EXCLUSION CRITERIA - Patients and Controls:
Secondary cause of Parkinsonism, e.g. Wilson's disease, neuroleptic use.
Dementia not due to PD, abnormal screening labs for dementia
Or severe dementia with MMSE less than 15.
Neurological disorder other than PD that would effect protocol (e.g. stroke, Alzheimer's disease).
Use of cholinergic or anticholinergic agents within 60 days.
Abnormal MRI other than mild atrophy.
Claustrophobia.
Pregnancy or breast feeding.
Prior participation in other research protocols or clinical care in the last year such that radiation exposure would exceed the annual limits.
Any conditions that increase risk for MRI (pacemaker, metallic foreign body, etc.).
Any medical condition that in the opinion of the investigators would, interfere with the safe conduct of the study.
Both healthy subjects and patients will be excluded if they have more than moderate hypertension. The subject may be on anti-hypertensive medications. The initial screening must show no more than moderate hypertension- i.e. less than 160/95. On baseline evaluation on the day of the scan (i.e., before injection of tracer), the subject must be asymptomatic (no headache, dizziness, neurological symptoms, or blurred vision) AND have sustained BP less than 180/100.
History of smoking tobacco, use of nicotine gum or patch or other uses of nicotine within last 5 years.
Inability to provide consent.
Study ID Numbers: | 030006, 03-N-0006 |
Study First Received: | April 11, 2003 |
Last Updated: | March 3, 2008 |
ClinicalTrials.gov Identifier: | NCT00058721 |
Health Authority: | United States: Federal Government |
Dementia Feasibility Dopamine Lewy Body |
Parkinson Disease PD Healthy Volunteer HV |
Dopamine Ganglion Cysts Movement Disorders Parkinson Disease Basal Ganglia Diseases Central Nervous System Diseases |
Healthy Parkinsonian Disorders Neurodegenerative Diseases Brain Diseases Dementia |
Nervous System Diseases |