Double-blind Cross-over Study of the Effect of Namenda on Short Term Memory and Attention in Patients With Mild to Moderate Traumatic Brain Injury, Protocol NAM-MD-44
Trial Snapshot
- Phase
- Phase 4
- Status
- Terminated
- Enrollment
- 11
- Locations
- 1
- Primary Endpoint
- Improvements From Baseline Scores After 6 and 12 Weeks of Memantine Compared to Placebo on the Brief VisuoSpatial Memory Test Revised (BVMT-R) Total Recall Score.
Study Overview
Brief Summary
The purpose of this study is to determine whether memantine (Namenda) improves memory and attention in patients with mild to moderate traumatic brain injury.
Detailed Description
Background and significance:
Each year in the United States approximately 1.5 million people sustain a traumatic brain injury (TBI) and of these approximately 80-90,000 result in long-term or lifelong disability. An estimated 5.3 million people are currently living with a disability due to TBI. The Centers for Disease Control (CDC) estimated that about 75% (1.1 million) of the reported TBIs are concussions or other forms of mild TBIs (MTBI). However, the incidence of MTBI has been vastly underestimated according to a CDC Report to Congress.
The long term problem associated with MTBI is primarily memory impairment. Memory impairment resulting form MTBI is not likely to improve with time beyond the initial stabilizing period of about one year post-injury. Dementia from Alzheimer's Disease produces cognitive problems that are similar to those experienced by patients with mild to moderate traumatic brain injury. The efficacy of Namenda for treatment of cognitive problems due to Alzheimer's Dementia suggests it may have efficacy for treatment of short term memory and attention deficits in patients with mild to moderate traumatic brain injury.
Overall Design and Plan of Study:
Twenty post-TBI patients whose TBI occurred at least 1 year prior to beginning the study will be recruited for this pilot study. Patients who meet screening criteria will have cognitive abilities assessed at baseline and at subsequent visits while taking Namenda or placebo. Patients will be randomly assigned to begin either Namenda or placebo and will then crossover to the alternate treatment. Each patient will participate in the study for a total of 32 to 34 weeks. Patients completing the study will have 10 total visits and 6 visits at which a cognitive test battery will be administered. This will include 24 weeks of study drug treatment (12 weeks of Namenda and 12 weeks of placebo) and two 4-week washout periods. Patients will be titrated up to 20 mg of Namenda per day. Namenda and placebo will be provided by Forest Laboratories Inc.
Study Design
- Study Type
- Interventional
- Allocation
- Randomized
- Intervention Model
- Crossover
- Primary Purpose
- Treatment
- Masking
- Triple (Participant, Investigator, Outcomes Assessor)
Eligibility Criteria
- Ages
- 18 Years to 50 Years (Adult)
- Sex
- All
- Accepts Healthy Volunteers
- No
Inclusion Criteria
- •Patients will have persistent memory and attention deficits due to a closed traumatic brain injury not less than one year prior to entrance in the study.
- •Meet or exceed American Congress of Rehabilitation Medicine (ACRM) criteria for mild TBI.
- •Mini-Mental State Exam (MMSE) score of 20 to 27 at the screening visit or a California Verbal Learning Test (CVLT) score for trials 1-5 one standard deviation lower than the age matched normative score. The CVLT score from the medical record may be used for entry criteria if it was obtained one year or more post-TBI and within two years of study entry.
- •Galveston Orientation and Amnesia Test (GOAT) score of at least
- •Be of sufficient cognitive ability to complete neuropsychological tests.
- •Male or female, 18-50 years of age.
- •Females of childbearing potential must use acceptable means of birth control and have a negative screening beta-human chorionic gonadotrophin (b-HCG) pregnancy test. Acceptable birth control includes hormonal birth control (such as oral birth control pills, implanted or injected contraceptives), an intrauterine device (IUD), surgical sterilization (such as tubal ligation or hysterectomy), a spermicide with barrier methods (condoms or diaphragm), or a partner who has had a vasectomy.
- •Patients taking donepezil (Aricept) or rivastigmine (Exelon) must be at a steady state dose for a minimum of six months.
- •Patients taking any other medication(s) affecting cognition must be at a steady state dose for a minimum of two months.
- •Able to provide written informed consent.
- •Able to read, write, and speak in English.
- •Willing and able to comply with the physician's instructions for all aspects of the study.
Exclusion Criteria
- •Patients must not have any medical or psychiatric disorder that in the opinion of the PI would interfere with or bias the assessment of efficacy or place their health at risk when placed on the memantine (Namenda) regimen.
- •Patients with a history of seizure are excluded.
- •Patients with a history of severe renal insufficiency are excluded.
- •Patients must not have taken any experimental drug within the last 30 days prior to entering the protocol.
- •Patients must not have taken any drug known to have major organ system toxicity within the last 30 days prior to entering the protocol.
- •Women who are pregnant, nursing, or intend to become pregnant during the study are excluded.
- •Patients with a penetrating TBI are excluded.
- •Patients whose screening laboratory values are 1.5 times greater than upper limits of normal range(ULN) are excluded.
- •Patients with systolic blood pressure greater than 180 mm Hg or less than 90 mm Hg or diastolic blood pressure greater than 105 mm Hg or less than 50 mm Hg at the screening visit are excluded.
- •Concomitant use of amantadine (Symmetrel) is prohibited and a washout period of 4 weeks is required before study entry.
Arms & Interventions
Memantine
Subjects will be titrated up to 20 mg of memantine per day for 12 weeks, followed by placebo for 12 weeks
Intervention: Memantine (Drug)
Placebo
Subjects will be titrated up to 20 mg of placebo per day for 12 weeks, followed by memantine for 12 weeks
Intervention: Placebo (Drug)
Outcomes
Primary Outcomes
Improvements From Baseline Scores After 6 and 12 Weeks of Memantine Compared to Placebo on the Brief VisuoSpatial Memory Test Revised (BVMT-R) Total Recall Score.
Time Frame: Baseline, 6 weeks, 12 weeks after beginning Namenda or placebo
BVMT-R total recall score. Each of the six equivalent, alternate BVMT-R stimulus forms consists of six geometric figures, printed in a 2 x 3 array, on a separate page of the Recall Stimulus Booklet. In the three Learning Trials, the respondent views the Recall Stimulus page for 10 seconds, then is asked to draw as many of the figures as possible, in their correct page locations. The total recall score is the sum of the three learning trials. After a 25-minute delay, which includes primarily verbal activities, the task is repeated. The respondent is asked to identify which of the 12 figures in the Recognition Stimulus Booklet were included in the 6 geometric figures on the original Recall Stimulus page. These scores are for the total recall raw score which ranges from 0-36 with 36 being the highest and best possible score.
Improvements From Baseline Scores After 6 and 12 Weeks of Memantine Compared to Placebo on the Hopkins Verbal Learning Test Revised (HVLT-R) Delayed Recall Scores.
Time Frame: Baseline, 6 weeks, and 12 weeks after beginning memantine or placebo
HVLT-R Learning Scores provide a brief assessment of immediate recall, delayed recall and delayed recognition. It is administered by reading the words aloud, then asking the client to verbally repeat the list of words (immediately; then after a delay), and identify the words from a word list that is presented verbally. The HVLT-R is easy to administer and score, and is well-tolerated by even significantly-impaired individuals. Tasks include three learning trials, which, when combined produce a total recall raw score; a delayed recall (25-30 minute delay) trial, and a yes/no delayed recognition trial. Raw scores are derived for Total Recall, Delayed Recall, Retention (percent retained) and a Recognition Discrimination Index. These scores are for the delayed recall learning raw score. The HVLT-R delayed recall raw score ranges from 0 to 12 with 12 being the highest and best possible score.
Improvements From Baseline Scores After 6 and 12 Weeks of Memantine Compared to Placebo on the Hopkins Verbal Learning Test Revised (HVLT-R) Total Recall Learning Scores.
Time Frame: Baseline, 6 weeks, and 12 weeks after beginning memantine or placebo
HVLT-R Learning Scores provide a brief assessment of immediate recall, delayed recall and delayed recognition. It is administered by reading the words aloud, then asking the client to verbally repeat the list of words (immediately; then after a delay), and identify the words from a word list that is presented verbally. The HVLT-R is easy to administer and score, and is well-tolerated by even significantly-impaired individuals. Tasks include three learning trials, which, when combined produce a total recall score; a delayed recall (25-30 minute delay) trial, and a yes/no delayed recognition trial. Raw scores are derived for Total Recall, Delayed Recall, Retention (percent retained) and a Recognition Discrimination Index. These results are for the HVLT-R total recall raw learning score. The HVLT-R total recall raw learning score ranges from 0 to 36 with 36 being the highest and best possible score.
Improvements From Baseline Scores After 6 and 12 Weeks of Memantine Compared to Placebo on the Brief VisuoSpatial Memory Test Revised (BVMT-R) Delayed Recall Score.
Time Frame: Baseline, 6 weeks, and 12 weeks after beginning memantine or placebo
BVMT-R Delayed recall. Each of the six equivalent, alternate BVMT-R stimulus forms consists of six geometric figures, printed in a 2 x 3 array, on a separate page of the Recall Stimulus Booklet. In the three Learning Trials, the respondent views the Recall Stimulus page for 10 seconds, then is asked to draw as many of the figures as possible, in their correct page locations. After a 25-minute delay, which includes primarily verbal activities, the task is repeated. The respondent is asked to identify which of the 12 figures in the Recognition Stimulus Booklet were included in the 6 geometric figures on the original Recall Stimulus page. These scores are for the delayed recall raw score which ranges from 0 to 12 with 12 being the highest and best possible score.
Secondary Outcomes
- Improvements From Baseline Scores After 6 and 12 Weeks of Memantine Compared to Placebo on the Trail Making Test Part A.(baseline, 6 weeks, 12 weeks)
- Improvements From Baseline Scores After 6 and 12 Weeks of Memantine Compared to Placebo on the Trail Making Test Part B.(Baseline, 6 weeks, and 12 weeks after beginning memantine or placebo)
- Improvements From Baseline Scores After 6 and 12 Weeks of Memantine Compared to Placebo on the Symbol Digit Modality Test (SDMT)Written Score.(baseline, 6 weeks, 12 weeks)
- Improvements From Baseline Scores After 6 and 12 Weeks of Memantine Compared to Placebo on the Symbol Digit Modality Test (SDMT) Oral Score.(Baseline, 6 weeks, and 12 weeks after beginning memantine or placebo)