We're building a better ClinicalTrials.gov. Check it out and tell us what you think!
ClinicalTrials.gov Menu

Memory Impairment Study (Mild Cognitive Impairment Study)

The safety and scientific validity of this study is the responsibility of the study sponsor and investigators. Listing a study does not mean it has been evaluated by the U.S. Federal Government. Read our disclaimer for details.
ClinicalTrials.gov Identifier: NCT00000173
Recruitment Status : Completed
First Posted : November 1, 1999
Last Update Posted : December 11, 2009
Alzheimer's Disease Cooperative Study (ADCS)
Information provided by:
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.

Condition or disease Intervention/treatment Phase
Alzheimer Disease Drug: Donepezil Drug: Vitamin E Phase 3

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.

Layout table for study information
Study Type : Interventional  (Clinical Trial)
Allocation: Randomized
Intervention Model: Parallel Assignment
Masking: Double
Primary Purpose: Treatment
Official Title: A Randomized, Double-Blind, Placebo-Controlled Trial of Vitamin E and Donepezil HCL (Aricept) to Delay Clinical Progression From Mild Cognitive Impairment (MCI) to Alzheimer's Disease (AD)
Study Start Date : March 1999
Actual Primary Completion Date : January 2004
Actual Study Completion Date : January 2004

Information from the National Library of Medicine

Choosing to participate in a study is an important personal decision. Talk with your doctor and family members or friends about deciding to join a study. To learn more about this study, you or your doctor may contact the study research staff using the contacts provided below. For general information, Learn About Clinical Studies.

Layout table for eligibility information
Ages Eligible for Study:   55 Years to 90 Years   (Adult, Older Adult)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   No

Inclusion Criteria:

  • 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.

Exclusion Criteria:

  • 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.
  • Psychotic features, agitation or behavioral problems within the last 3 months which could lead to difficulty complying with the protocol.
  • History of alcohol or substance abuse or dependence within the past 2 years (DSM IV criteria).
  • History of schizophrenia (DSM IV criteria).
  • 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.
  • 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.

  • 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.
  • Any prior use of any FDA approved medications for the treatment of Alzheimer's disease (e.g. tacrine, donepezil, or other newly approved medications).
  • Use of any investigational drugs within 30 days or 5 half-lives, whichever is longer, prior to screening.
  • Subjects who, in the investigator's opinion, will not comply with study procedures.

Information from the National Library of Medicine

To learn more about this study, you or your doctor may contact the study research staff using the contact information provided by the sponsor.

Please refer to this study by its ClinicalTrials.gov identifier (NCT number): NCT00000173

Show Show 72 study locations
Sponsors and Collaborators
National Institute on Aging (NIA)
Alzheimer's Disease Cooperative Study (ADCS)
Layout table for investigator information
Principal Investigator: Leon Thal, MD Alzheimer's Disease Cooperative Study
Additional Information:
Publications of Results:
Other Publications:
Publications automatically indexed to this study by ClinicalTrials.gov Identifier (NCT Number):
Layout table for additonal information
ClinicalTrials.gov Identifier: NCT00000173    
Other Study ID Numbers: IA0011
3U01AG010483-08S2 ( U.S. NIH Grant/Contract )
First Posted: November 1, 1999    Key Record Dates
Last Update Posted: December 11, 2009
Last Verified: June 2009
Keywords provided by National Institute on Aging (NIA):
Mild cognitive impairment
Alzheimer's disease
Vitamin E
Cholinergic agents
Cholinesterase inhibitors
Additional relevant MeSH terms:
Layout table for MeSH terms
Alzheimer Disease
Cognitive Dysfunction
Brain Diseases
Central Nervous System Diseases
Nervous System Diseases
Neurodegenerative Diseases
Neurocognitive Disorders
Mental Disorders
Cognition Disorders
Vitamin E
Physiological Effects of Drugs
Cholinesterase Inhibitors
Enzyme Inhibitors
Molecular Mechanisms of Pharmacological Action
Cholinergic Agents
Neurotransmitter Agents
Nootropic Agents
Protective Agents