Memory Impairment Study (Mild Cognitive Impairment Study)
- Conditions
- Alzheimer Disease
- Registration Number
- NCT00000173
- Lead Sponsor
- National Institute on Aging (NIA)
- Brief Summary
The National Institute on Aging (NIA) is launching a nationwide treatment study targeting individuals with mild cognitive impairment (MCI), a condition characterized by a memory deficit, but not dementia. An NIA-funded study recently confirmed that MCI is different from both dementia and normal age-related changes in memory. Accurate and early evaluation and treatment of MCI individuals might prevent further cognitive decline, including development of Alzheimer's disease (AD).
The Memory Impairment Study is the first such AD prevention clinical trial carried out by NIH, and will be conducted at 65-80 medical research institutions located in the United States and Canada. This study will test the usefulness of two drugs to slow or stop the conversion from MCI to AD. The trial will evaluate placebo, vitamin E, and donepezil, an investigational agent approved by the Food and Drug Administration for another use. Vitamin E (alpha-tocopherol) is thought to have antioxidant properties, and was shown in a 1997 study to delay important dementia milestones, such as patients' institutionalization or progression to severe dementia, by about seven months.
- Detailed Description
This clinical trial will be a multicenter, randomized, double-blind, placebo- controlled, parallel-group study of vitamin E and donepezil in 720 subjects with mild cognitive impairment (MCI). Subjects will be randomized to one of three treatment groups (240 subjects per treatment group): 1) Placebo vitamin E and placebo donepezil plus a multivitamin daily. 2) Vitamin E (2,000 I) and placebo donepezil plus a multivitamin daily.3) Donepezil (10 mg) and placebo vitamin E plus a multivitamin daily.
The study will be conducted over three years, with clinical evaluations every 3 months for the first 6 months and then every 6 months. Subjects randomized to donepezil will start a dose of 5 mg daily. Donepezil will be increased to 10 mg after six weeks. Subjects randomized to vitamin E will start at 1,000 I daily. The dose of Vitamin E will be increased to 2,000 I after six weeks. There will be a 12-month recruitment period. The primary endpoint will be time to development of Probable or Possible AD according to NINCDS-ADRDA criteria. Upon determination of a clinical diagnosis of AD, documentation will be sent to the ADCS Coordinating Center and forwarded to the Central Review Committee for verification. Upon verification, of conversion to diagnosis of AD, subjects will stop taking the donepezil study medication or its corresponding placebo, without breaking the blind, and will be offered open label donepezil at a scheduled visit one month after the prior diagnostic visit. Donepezil will be offered to subjects who convert to AD until the subject completes three years from the baseline visit. Based on an estimated incidence of AD of 15% per year, the study has 85% power to detect a 33% or greater reduction in conversion to AD over 3 years. Secondary outcome measures will include change on the Alzheimer's Disease Assessment Scale (ADAS-COG), the Neuropsychological Battery, the Mini-Mental State Exam (MMSE), Clinical Dementia Rating Scale (CDR), the Global Deterioration Scale (GDS), ADCS- Activities of Daily Living Inventory (ADCS-ADL), a Pharmacoeconomics scale, and a Quality of Life scale. Compliance will be monitored through the measurement of alpha-tocopherol levels and pill counts at each visit.
Recruitment & Eligibility
- Status
- COMPLETED
- Sex
- All
- Target Recruitment
- Not specified
- Memory complaints and memory difficulties which are verified by an informant.
- Abnormal memory function documented by scoring below the education adjusted cutoff on the Logical Memory II subscale (Delayed Paragraph Recall) from the Wechsler Memory Scale - Revised (the maximum score is 25): a) less than or equal to 8 for 16 or more years of education, b) less than or equal to 4 for 8-15 years of education, c) less than or equal to 2 for 0-7 years of education.
- Mini-Mental Exam score between 24 and 30 (inclusive) (Exceptions may be made for subjects with less than 8 years of education at the discretion of the project director.).
- Clinical Dementia Rating = 0.5. Memory Box score must be at least 0.5.
- General cognition and functional performance sufficiently preserved such that a diagnosis of Alzheimer's disease cannot be made by the site physician at the time of the screening visit.
- No significant cerebrovascular disease: Modified Hachinski score of less than or equal to 4.
- Age between 55 and 90 (inclusive).
- Permitted medications stable for at least 1 month prior to screening. In particular: a) Subjects may take stable doses of antidepressants lacking significant anticholinergic side effects (if they are not currently depressed and do not have a history of major depression within the past 2 years). b) Estrogen replacement therapy is permissible. c) Ginkgo biloba is permissible, but discouraged.
- Hamilton Depression rating scale score of less than or equal to 12 on the 17-item scale.
- Informant is available who has frequent contact with the subject (e.g. an average of 10 hours per week or more), agrees to monitor administration of study drug, observe for adverse events, and accompany the subject to all clinic visits for the duration of the protocol.
- CT or MRI scans within 12 months prior to screening without evidence of infection, infarction, or other focal lesions and without clinical symptoms suggestive of intervening neurological disease. A lacune in a non-critical brain area which is not believed to contribute to the subject's cognitive impairment is permissible.
- Adequate visual and auditory acuity to allow neuropsychological testing.
- Good general health with no additional diseases expected to interfere with the study.
- Normal B12, RPR, and Thyroid Function Tests or without any clinically significant abnormalities that would be expected to interfere with the study.
- ECG without clinically significant abnormalities that would be expected to interfere with the study.
- Subject is not pregnant, lactating, or of childbearing potential (i.e. women must be two years post-menopausal or surgically sterile).
- Agreement not to take other vitamin supplements (including Vitamin E), multivitamins, other than those provided by the study.
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Any significant neurologic disease other than suspected incipient Alzheimer's disease, such as Parkinson's disease, multi-infarct dementia, Huntington's disease, normal pressure hydrocephalus, brain tumor, progressive supranuclear palsy, seizure disorder, subdural hematoma, multiple sclerosis, or history of significant head trauma followed by persistent neurologic defaults or known structural brain abnormalities.
-
Major depression or another major psychiatric disorder as described in DSM IV within the past 2 years.
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Psychotic features, agitation or behavioral problems within the last 3 months which could lead to difficulty complying with the protocol.
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History of alcohol or substance abuse or dependence within the past 2 years (DSM IV criteria).
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History of schizophrenia (DSM IV criteria).
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Any significant systemic illness or unstable medical condition which could lead to difficulty complying with the protocol including: a) History of systemic cancer within the last 5 years (non-metastatic skin cancers are acceptable). b) History of myocardial infarction within the past year or unstable or severe cardiovascular disease including angina or CHF with symptoms at rest. c) Clinically significant obstructive pulmonary disease or asthma. d) Clinically significant and unstable gastrointestinal disorder such as ulcer disease or a history of active or occult gastrointestinal bleeding within two years. e) Clinically significant laboratory test abnormalities on the battery of screening tests (hematology, prothrombin time, chemistry, urinalysis, ECG). f) Insulin-requiring diabetes or uncontrolled diabetes mellitus. g) Uncontrolled hypertension (systolic BP greater than 170 or diastolic greater than 100). h) History of clinically significant liver disease, coagulopathy, or vitamin K deficiency within the past 2 years.
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Medications a) Use of centrally active beta-blockers, narcotics, methyldopa and clonidine within 4 weeks prior to screening. b) Use of anti-Parkinsonian medications (e.g. Sinemet, amantadine, bromocriptine, pergolide and selegiline) within 2 months prior to screening. c) Use of neuroleptics or narcotic analgesics within 4 weeks prior to screening. d) Use of long-acting benzodiazepines or barbituates within 4 weeks prior to screening. e) Use of short-acting anxiolytics or sedative hypnotics more frequently than 2 times per week within 4 weeks prior to screening (note: sedative agents should not be used within 72 hours of screening).
f) Initiation or change in dose of an antidepressant lacking significant cholinergic side effects within the 4 weeks prior to screening (use of stable doses of antidepressants for at least 4 weeks prior to screening is acceptable). g) Use of systemic corticosteroids within 3 months prior to screening. h) Medications with significant cholinergic or anticholinergic side effects (e.g. pyridostigmine, tricyclic antidepressants, meclizine, and oxybutynin) within 4 weeks prior to screening. i) Use of anti-convulsants (e.g. Phenytoin, Phenobarbital, Carbamazepine) within 2 months prior to screening. j) Use of warfarin (Coumadin) within 4 weeks prior to screening.
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Vitamin Supplements a) Use of vitamin supplements other than standard multivitamin included as part of the treatment intervention used in this protocol within 2 weeks prior to screening.
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Any prior use of any FDA approved medications for the treatment of Alzheimer's disease (e.g. tacrine, donepezil, or other newly approved medications).
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Use of any investigational drugs within 30 days or 5 half-lives, whichever is longer, prior to screening.
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Subjects who, in the investigator's opinion, will not comply with study procedures.
Study & Design
- Study Type
- INTERVENTIONAL
- Study Design
- PARALLEL
- Primary Outcome Measures
Name Time Method
- Secondary Outcome Measures
Name Time Method
Trial Locations
- Locations (72)
University of Southern California
๐บ๐ธLos Angeles, California, United States
University of California, Los Angeles
๐บ๐ธLos Angeles, California, United States
Baumel-Eisner Neuromedical Institute, Boca Raton
๐บ๐ธBoca Raton, Florida, United States
Premiere Research Institute
๐บ๐ธWest Palm Beach, Florida, United States
Emory University
๐บ๐ธAtlanta, Georgia, United States
Johns Hopkins University
๐บ๐ธBaltimore, Maryland, United States
MCP Hahnemann
๐บ๐ธPhiladelphia, Pennsylvania, United States
Sunnybrook Health Science Center
๐จ๐ฆToronto, Ontario, Canada
Indiana University
๐บ๐ธIndianapolis, Indiana, United States
Massachusetts General Hospital
๐บ๐ธBoston, Massachusetts, United States
University of Nevada
๐บ๐ธLas Vegas, Nevada, United States
University Hospitals of Cleveland
๐บ๐ธCleveland, Ohio, United States
University of Washington
๐บ๐ธSeattle, Washington, United States
Affiliated Research Instiute
๐บ๐ธSan Diego, California, United States
University of California, San Diego
๐บ๐ธSan Diego, California, United States
University of Minnesota
๐บ๐ธMinneapolis, Minnesota, United States
Duke University Medical Center
๐บ๐ธDurham, North Carolina, United States
University of Rochester
๐บ๐ธRochester, New York, United States
Barrow Neurological Group
๐บ๐ธPhoenix, Arizona, United States
University of California, San Francisco
๐บ๐ธSan Francisco, California, United States
Vanderbilt University Medical Center
๐บ๐ธNashville, Tennessee, United States
Baylor College of Medicine
๐บ๐ธHouston, Texas, United States
Maimonides Medical Center
๐บ๐ธBrooklyn, New York, United States
Elizabeth Bruyere Centre
๐จ๐ฆOttawa, Ontario, Canada
Marshfield Clinic
๐บ๐ธMarshfield, Wisconsin, United States
Columbia University
๐บ๐ธNew York, New York, United States
St. Joseph's Health Center
๐จ๐ฆLondon, Ontario, Canada
Brown University
๐บ๐ธPawtucket, Rhode Island, United States
Washington University
๐บ๐ธSt. Louis, Missouri, United States
NYU Medical Center
๐บ๐ธNew York, New York, United States
Mount Sinai Medical Center
๐บ๐ธNew York, New York, United States
University of Pennsylvania
๐บ๐ธPhiladelphia, Pennsylvania, United States
ClinSearch, Inc.
๐บ๐ธSummit, New Jersey, United States
Nathan S. Kline Institute for Psychiatric Research
๐บ๐ธOrangeburg, New York, United States
Dartmouth Hitchcock Medical Center
๐บ๐ธLebanon, New Hampshire, United States
Memory Disorders Institute
๐บ๐ธLakehurst, New Jersey, United States
Univ. of New Mexico
๐บ๐ธAlbuquerque, New Mexico, United States
SUNY Stony Brook
๐บ๐ธStony Brook, New York, United States
Burke Medical Research Institute
๐บ๐ธWhite Plains, New York, United States
University of Arizona
๐บ๐ธTucson, Arizona, United States
UC Irvine Institute for Brain Aging and Dementia
๐บ๐ธIrvine, California, United States
East Bay Institute
๐บ๐ธMartinez, California, United States
Mayo Clinic Jacksonville
๐บ๐ธJacksonville, Florida, United States
Baumel-Eisner Neuromedical Institute, Ft. Lauderdale
๐บ๐ธFt. Lauderdale, Florida, United States
Wein Center
๐บ๐ธMiami Beach, Florida, United States
University of Miami
๐บ๐ธPort Charlotte, Florida, United States
Baumel-Eisner Neuromedical Institute, MiamiBeach
๐บ๐ธMiami Beach, Florida, United States
Augusta VA Medical Center
๐บ๐ธAugusta, Georgia, United States
Northwestern University
๐บ๐ธChicago, Illinois, United States
University of Kentucky
๐บ๐ธLexington, Kentucky, United States
Rush Presbyterian St. Luke's Medical Center
๐บ๐ธChicago, Illinois, United States
Southern Illinois University
๐บ๐ธSpringfield, Illinois, United States
Princeton Biomedical - Toms River
๐บ๐ธToms River, New Jersey, United States
Alzheimer's Research Corp.
๐บ๐ธWest Long Branch, New Jersey, United States
Mayo Clinic
๐บ๐ธRochester, Minnesota, United States
Oregon Health Sciences University
๐บ๐ธPortland, Oregon, United States
Sutter Institute for Medical Research
๐บ๐ธSacramento, California, United States
University of South Florida
๐บ๐ธTampa, Florida, United States
Yale University
๐บ๐ธNew Haven, Connecticut, United States
University of Michigan
๐บ๐ธAnn Arbor, Michigan, United States
Clinical Neuroscience Research Unit
๐บ๐ธBurlington, Vermont, United States
University of British Columbia
๐จ๐ฆVancouver, British Columbia, Canada
Fredericton Medical Clinic
๐จ๐ฆFredericton, New Brunswick, Canada
Princeton Biomedical Research, PA
๐บ๐ธPrinceton, New Jersey, United States
University of Pittsburgh
๐บ๐ธPittsburgh, Pennsylvania, United States
Medical University of South Carolina
๐บ๐ธNorth Charleston, South Carolina, United States
Jewish General Hospital Memory Clinic
๐จ๐ฆMontreal, Quebec, Canada
McGill Centre for Studies in Aging
๐จ๐ฆVerdun, Quebec, Canada
Geriatric Medicine Research Group
๐จ๐ฆHalifax, Nova Scotia, Canada
University of Calgary
๐จ๐ฆCalgary, Alberta, Canada
Southwestern Vermont Medical Center
๐บ๐ธBennington, Vermont, United States
University of Kansas Medical Center
๐บ๐ธKansas City, Kansas, United States