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Metabolic Cerebral Imaging in Incipient Dementia (MCI-ID)

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ClinicalTrials.gov Identifier: NCT00329706
Recruitment Status : Completed
First Posted : May 25, 2006
Last Update Posted : May 2, 2017
Centers for Medicare and Medicaid Services
Information provided by (Responsible Party):
Daniel H. Silverman, University of California, Los Angeles

May 24, 2006
May 25, 2006
May 2, 2017
June 2006
January 2017   (Final data collection date for primary outcome measure)
  • change from baseline in neuropsychological (cognitive,functional) test results [ Time Frame: baseline and 2 years ]
  • utilization of healthcare resources [ Time Frame: baseline and 2 years ]
  • PET results, compared with working diagnoses made before and after time of PET [ Time Frame: baseline and up to 2 years ]
  • rates of prescription of AD-specific therapies [ Time Frame: baseline and 2 years ]
  • PET results compared with early diagnoses, before and after time of PET
  • rates of prescription of AD-specific therapies
  • change from baseline in neuropsychological (cognitive,functional) test results
  • utilization of healthcare resources
Complete list of historical versions of study NCT00329706 on ClinicalTrials.gov Archive Site
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Metabolic Cerebral Imaging in Incipient Dementia (MCI-ID)
Early and Long-Term Value of Imaging Brain Metabolism
A brain PET scan is recognized as "reasonable and necessary" for some patients with "a recently established diagnosis of dementia" (Centers for Medicare and Medicaid Services, Decision Memo CAG-00088R, 2004), but evidence is less clear for patients having less severe cognitive problems. A substantial portion of such patients will develop Alzheimer's disease and other forms of dementia, which affect millions of people in the U.S., costing us over $100 billion annually. This project employs a prospective randomized protocol to determine whether PET scanning can help distinguish those patients with early Alzheimer's changes in their brains from those having other causes of cognitive impairment more accurately than is done with current clinical practices alone, and lead to earlier, more effective therapies which extend patients' abilities to think and function independently.

People experiencing mild cognitive changes represent an epidemiologically major segment of the geriatric patient population. In the present proposal, we aim to measure how knowledge of cerebral metabolic information 1) influences working diagnoses and management of patients being evaluated for symptoms of early cognitive decline, and 2) impacts upon long-term clinical outcomes, particularly of subjects having metabolic patterns consistent with presence of Alzheimer's disease (AD)-like changes in their brains. A total of 710 patients suffering from documentable decline of cognitive function in the absence of overt dementia will be studied at nine U.S. institutions with extensive experience and infrastructure in place for the evaluation of Alzheimer's disease and related disorders, and for neuroimaging. In this prospective, investigation, subjects will undergo baseline neuropsychologic testing and neuroimaging with MRI and FDGPET. PET scan reports will be sealed and randomized with respect to whether they are released to patients' managing physicians at the time of interpretation, or two years after the time that scanning is performed.

Working diagnoses of managing physicians will be recorded, as will the treatment decisions made by the managing physicians and their patients. Cognitive abilities, functional status, utilization of healthcare resources, and other clinical and social contact parameters will be assessed every six months. Our major hypotheses are that among patients whose PET results are immediately conveyed to their referring physicians, diagnoses and management plans will be positively affected, leading to more effective utilization of healthcare resources and to maintenance of cognitive and functional abilities at a higher level. This project will also provide a rich source of data that can be used to address questions outside of its major focus (e.g., prognostic accuracy of volumetric MRI data used instead of, or in conjunction with, FDG-PET data; incremental predictive value of applying statistically parameterizing and/or quantifying software tools to imaging data).

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Allocation: Randomized
Intervention Model: Parallel Assignment
Masking: Single (Participant)
Primary Purpose: Diagnostic
Procedure: FDG-PET brain scan
The difference in the two arms' interventions is the time at which the FDG-PET brain scan information is available for the subjects' managing physicians. Experimental arms will have an immediate release of the PET report, while the Active Comparator arms will have a delayed release of 2 years.
Other Name: [F-18]FDG PET brain scan administered once to both arms
  • Experimental: 1
    Experimental arm will have an immediate release of the PET report
    Intervention: Procedure: FDG-PET brain scan
  • Active Comparator: 2
    Active Comparator arm will have a delayed release of 2 years
    Intervention: Procedure: FDG-PET brain scan
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*   Includes publications given by the data provider as well as publications identified by ClinicalTrials.gov Identifier (NCT Number) in Medline.
January 2017
January 2017   (Final data collection date for primary outcome measure)

Inclusion Criteria:

  • Cognitive deficit and/or personality change is present, as observable by physician and/or close contact(s) of the patient; or in the absence of this, the patient provides a clear history of decline which the patient's physician deems to be reliable.
  • If history or neurologic exam reveals findings suspicious for stroke, tumor, bleed, ictal activity, or hydrocephalus, then CT/MRI and appropriate neurological or neurosurgical consultation must have been obtained.
  • Standard history, physical, and laboratory screen have been performed to identify possible presence of depression, substance abuse, malnourishment, medication effects and interactions, cardiopulmonary compromise, electrolyte/calcium imbalance, anemia, hypoxemia, infection, thyroid dysfunction, renal dysfunction, hepatic dysfunction, or glucose dysregulation.
  • Any positive findings revealed in 2) or 3) above have been appropriately treated, wherever possible, but cognitive/behavioral deficit persists post-therapy.

Exclusion Criteria:

  • Subjects under age 65 will not be recruited, in order to enhance the clinical relevance of the project by focusing on the age groups in whom serious concerns about early signs and symptoms of senile onset dementia are most typically emerging.
  • Overt dementia, as discussed above.
  • Cognitive dysfunction has impaired subject's ability to perform activities of daily living.
  • Present or past history of thyroid disease (due to effects of both the disease and thyroid hormone replacement therapy on brain metabolism that we and others have begun to identify, but which remain incompletely characterized.)
  • Claustrophobia or metal in body or other condition that would preclude PET or MRI from being acquired, or visual, auditory or motor deficits that would preclude accurate neuropsychological testing.
  • Cholinesterase inhibition therapy already initiated.
Sexes Eligible for Study: All
65 Years and older   (Adult, Senior)
Contact information is only displayed when the study is recruiting subjects
United States
02-10-079, 03-04-026
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Daniel H. Silverman, University of California, Los Angeles
University of California, Los Angeles
Centers for Medicare and Medicaid Services
Principal Investigator: Daniel H Silverman, MD, PhD University of California, Los Angeles
University of California, Los Angeles
May 2017

ICMJE     Data element required by the International Committee of Medical Journal Editors and the World Health Organization ICTRP