The purpose of this study is to test a new procedure to treat Alzheimer's disease. The procedure is called intermittent Deep Brain Stimulation (DBS) of the nucleus basalis of Meynert. There will be up to six participants enrolled at Wellstar MCG Memory Clinic. There will be another six participants similarly enrolled to act as a control group that does not receive DBS. This second group will document the course of progression of Alzheimer's disease under the normal standard of care. The main goal of the study is to determine if DBS can sustain or improve cognition in Alzheimer's disease for at least two years. Participant data, with identifying information removed, may be shared with online repositories for comparison with trials with similar subjects.
Age:65 minimum
Age:85 maximum
Probable, early-stage Alzheimer's Disease, as defined by NIA-AA 2018 criteria and positive PET for beta amyloid,
no Lewy-Body-dementia or other form of dementia
• clinical co-morbidity interfering with study (e.g. head trauma requiring medical treatment in the 2 years prior, brain tumor, subdural hematoma, or other clinically significant space-occupying lesion on brain CT or MRI), or other implant precluding high field MRI scans.
current major psychiatric disorder such as schizophrenia, bipolar disorder or major depressive disorder based on psychiatric consult at screening visit, or past medical history prior suicidal attempts or suicidal crises
Another concurrent CNS condition (ie, stroke, Parkinson's disease, Lewy-Body dementia or other form of dementia, other evidence of significant structural brain pathology).
Medical history of seizure disorder including epilepsy
Parallel
Intermittent deep brain stimulation of the nucleus basalis of Meynert
DeviceSubjects will receive intermittent deep brain stimulation of the nucleus basalis of Meynert for 50 minutes each day.
Dementia Rating Scales
Subjects will be evaluated using the Clinical Dementia Rating Sum of Boxes scale. The investigators seeks for half of the intervention arm participants to have better (lower) or equal scale scores two years after intervention onset than they had at onset. This scale ranges from 0 to 18, and subjects will score from 2 to 6 at study entry.
Alzheimer's Disease Assessment Scale, Cognitive Subscale
The investigators seeks for scores on the Alzheimer's Disease Assessment Scale, Cognitive Subscale, to be equal or lower in half of the participants two years after the intervention begins compared to their value at study onset. This scale ranges from 0 to 85, and subjects at onset will likely have scores between 13 and 30.
PET scans for beta amyloid
PET scans will be obtained at onset and annually through two years. The investigators seek for a reduction in the Standard Uptake Volume Ratio (SUVr) in the intervention arm compared to the control arm. SUVr is a ratio of image intensity in a reference region of the brain compared to the cerebral cortex. SUVr averages 1.22 in subjects diagnosed with Alzheimer's, and 1.0 in non-Alzheimer's controls.
Anxiety scales
Subjects will receive a GAD-7 questionnaire at the same times as cognitive assessments. The investigators seek for reductions in the GAD-7 values in the intervention arm compared to the control arm. The GAD-7 scale ranges from 0 to 21, and higher scores indicate more anxiety.
Beta amyloid PET imaging, Centiloid scale.
PET scans will be obtained from particpants at onset and annually through two years. The investigators seek for a reduction in the Centiloid Scale in the intervention arm compared to the control arm. The Centiloid scale is 0CL on average in a 45 year old normal, and 100CL in a person with Alzheimer's dementia.
PHQ-9 questionaire
Participants will receive a PHQ-9 questionnaire at the same times as cognitive assessments. The investigators seek for reductions in this scale in the intervention arm compared to the control arm. The PHQ-9 depression scale has scores from 0 to 27, and higher scores indicate more depression.
Click on the lead sponsor to view all of their trials.
