Effect of Modulating Gamma Oscillations Using tACS
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|ClinicalTrials.gov Identifier: NCT03412604|
Recruitment Status : Recruiting
First Posted : January 26, 2018
Last Update Posted : September 11, 2018
|Condition or disease||Intervention/treatment||Phase|
|Alzheimer Disease||Device: Transcranial Alternating Current Stimulation (tACS)||Not Applicable|
This study will leverage all this accumulated knowledge by implementing an intervention based on multiple, individualized multifocal tACS stimulation sessions based on individual PET and MRI information in patients with amyloid-positive PET with the hope that this leads to microglia activation and decrease in cerebral amyloid and tau depositions in human patients with AD.This would have immense translational impact, as gamma tACS is an intervention that is portable, does not require expensive hardware, can be widely applied to large numbers of patients with AD, as well as, given its favorable side effect profile, even to patients at earlier stages of the disease who have cerebral amyloid/tau without clinical symptoms.
The investigators aim to enroll 10 individuals with AD with evidence of increased cerebral amyloid burden on amyloid PET imaging. This would allow for a final sample size of 5-6 fully evaluable subjects. Each subject's participation in this study will consist of approximately 31-35 visits: 1 day for consent and screening procedures, 5-7 days of baseline procedures (this includes the PET scans), 20 tACS study visits, and 5-7 days of follow-up assessments. Subjects will undergo baseline cognitive assessment, structural and functional MRI characterization, PET imaging to assess amyloid burden, tau deposition and level of microglia activation, and resting-state EEG measurement. Additionally, subjects will undergo a TMS-EEG and a tACS-EEG recording session to assess brain plasticity levels and identify markers of response to stimulation. All subjects will subsequently undergo 20 sessions of gamma-frequency (40 Hz) tACS. At the end of the 20 sessions, subjects will then repeat the baseline assessments over 5-7 visits, including repeat PET imaging to assess for changes in amyloid burden, tau deposition, and microglia activation.
|Study Type :||Interventional (Clinical Trial)|
|Estimated Enrollment :||10 participants|
|Intervention Model:||Single Group Assignment|
|Masking:||None (Open Label)|
|Official Title:||Effect of Modulating Gamma Oscillations by Transcranial Alternating Current Stimulation on Brain Structure and Function in Humans|
|Actual Study Start Date :||August 2, 2018|
|Estimated Primary Completion Date :||May 15, 2019|
|Estimated Study Completion Date :||May 15, 2019|
Transcranial alternating current stimulation (tACS) tuned at the frequency of 40Hz (gamma frequency) will be applied for 1 hour in 20 sessions on consecutive weekdays. The tACS intervention (20 sessions) will be preceded and followed by amyloid, microglia and tau PET imaging as well as a clinical/cognitive evaluation. The assessment of the effect of stimulation on microglia activation, amyloid deposition and tau deposition will constitute a primary outcome measure. Assessment of adverse effects will be also evaluated as a secondary outcome. The effect of brain stimulation on brain connectivity will be assessed by EEG and MRI and cognitive function.
Device: Transcranial Alternating Current Stimulation (tACS)
tACS will be applied at a frequency of 40Hz and targeting the area of maximal tracer uptake on amyloid PET imaging using an individualized multielectrode design to maximize the induced electrical current to the target region.
Other Name: Non-invasive Brain Stimulation
- Incidence of Treatment-Emergent Adverse Events [ Time Frame: Up to 12 weeks ]Adverse Events as a result of tACS stimulation will be reported
- PET amyloid burden [ Time Frame: up to 12 weeks ]Changes in the amyloid load observed via PET imaging will be evaluated by comparing PET data acquired before and after the 20 tACS sessions
- PET tau deposition [ Time Frame: up to 12 weeks ]Changes in the tau deposition observed via PET imaging will be evaluated by comparing PET data acquired before and after the 20 tACS sessions
- PET Microglia activation [ Time Frame: up to 12 weeks ]Changes in the microglia activation observed via PET imaging will be evaluated by comparing PET data acquired before and after the 20 tACS sessions
- Alzheimer's Disease Assessment Scale -Cog Score [ Time Frame: up to 12 weeks ]Change in Adas-Cog score will be reported, to document a potential clinical benefit of tACS. The scale ranges from a total score of 0-70 with higher score indicating greater cognitive impairment.
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): NCT03412604
|Contact: Alvaro Pascual-Leone, MDfirstname.lastname@example.org|
|Contact: Rachel Paciorek, MAemail@example.com|