The Effect of Memantine on Brain Structure and Chemistry in Alzheimer's Disease Patients
|Study Design:||Allocation: Randomized
Intervention Model: Parallel Assignment
Masking: Participant, Care Provider, Investigator, Outcomes Assessor
Primary Purpose: Treatment
|Official Title:||The Effect of Memantine on Brain Structure and Chemistry in Alzheimer's Disease Patients: A Randomized, Placebo-Controlled, 52-Week Clinical Trial|
- NAA/Cr Ratio [ Time Frame: Baseline; Year 1 ]To determine if memantine has a neuroprotective effect on magnetic resonance spectroscopic imaging (MRS) measures of hippocampal n-acetyl aspartate (NAA) and magnetic resonance imaging volumetric measures (MRI) of hippocampal volume.
- Mean Change on the ADAS-Cog Score After 1 Year [ Time Frame: Baseline; Year 1 ]Progression of cognitive functioning as measured by performance on the Alzheimer's Disease (AD) Assessment Scale-cognitive subscale (ADAS-Cog). ADAS-cog is the most popular cognitive testing instrument used in clinical trials of nootropics, and measures disturbances of of memory, language, praxis, attention and other cognitive abilities which are often referred to as the core symptoms of AD. Responses are summed for an overall score which can range from 0-70. The greater the dysfunction, the higher the score. A typical score for a person without dementia is 5.
|Study Start Date:||May 2005|
|Study Completion Date:||February 2010|
|Primary Completion Date:||June 2009 (Final data collection date for primary outcome measure)|
Other Name: Namenda
Placebo Comparator: Control
10 mg Placebo pill
Drug: Placebo pill
10mg placebo pill
Other Name: placebo
Alzheimer's disease (AD) is the most common form of dementia. Currently, there are more than 4 million individuals with dementia in the United States with at least 400,000 deaths annually. AD is a progressive, neurodegenerative disorder, characterized neuropathologically by widespread neuronal loss, presence of neurofibrillary tangles, and deposits of beta amyloid in cerebral blood vessels and neuritic plaques. Since the medial-temporal lobes, hippocampus, and association cortex are significantly impacted it is not surprising that the primary symptom of AD is a decline in cognitive functioning that leads to marked impairment in daily functioning. In particular, memory impairments, visuospatial decline, language difficulties, and loss of executive function are central cognitive symptoms of this illness. Behavioral disturbances such as agitation and hallucinations often accompany disease progression. The illness lasts approximately 7 to 10 years, with patients requiring total care in the latter stages. Thus, AD places a tremendous emotional and economic burden on both patients and their caregivers. Beyond a cure, therapeutic approaches which would alleviate the symptoms or delay progression could be of substantial psychological and economic benefit. Recent placebo controlled clinical trials have shown memantine to be efficacious in the treatment of patients with moderate to severe AD.
The aim of the proposed study is to determine if the NMDA receptor antagonist memantine has a neuroprotective effect on magnetic resonance spectroscopic imaging (MRS) measures of brain NAA and magnetic resonance imaging (MRI) volumetric measures of hippocampal volume. In secondary analyses, we will determine if measures of clinical stabilization produced by memantine in the treatment of Alzheimer's disease (AD) parallels stabilization of MRS measures of brain NAA and MRI volumetric measures of hippocampal volume.
Please refer to this study by its ClinicalTrials.gov identifier: NCT00255086
|United States, California|
|VA Palo Alto Health Care System|
|Palo Alto, California, United States, 94304|
|Study Director:||J. Wesson Ashford Jr., MD, PhD||Stanford University|
|Principal Investigator:||Jerome A Yesavage||Stanford University|