Alzheimer Disease Clinical Trial
Official title:
VINCI-AD: An Investigation of Transcutaneous Vagus Nerve Stimulation in Mild Cognitive Impairment
NCT number | NCT05514756 |
Other study ID # | VINCI-AD |
Secondary ID | |
Status | Completed |
Phase | N/A |
First received | |
Last updated | |
Start date | June 1, 2022 |
Est. completion date | June 30, 2023 |
Verified date | June 2024 |
Source | Tallaght University Hospital |
Contact | n/a |
Is FDA regulated | No |
Health authority | |
Study type | Interventional |
The VINCI-AD study will investigate the impact of non-invasive vagus nerve stimulation (VNS) on memory in participants with existing mild memory impairment. VNS is a safe, existing treatment, licensed in epilepsy and depression. Until recently, stimulating the vagus nerve involved an operation (invasive VNS) but we can now perform VNS by stimulating a nerve in the outer ear with a very gentle current using a small earpiece, called transcutaneous vagus nerve stimulation (t-VNS). Previous studies have indicated that invasive VNS may improve memory in people with no cognitive issues or with dementia. No study has examined the use of t-VNS in people with diagnosed mild memory issues. The main aim of this study is to assess the feasibility of using t-VNS in participants with Mild Cognitive Impairment (MCI). Other objectives include: 1) Determining the optimal stimulation settings to improve memory; 2) Assessment of safety and tolerability of VNS in participants with memory impairment ; 3) Exploration of impact of non-invasive VNS on brain oxygenation via near-infrared spectroscopy (NIRS): 4) Assessment of impact of VNS on blood markers of inflammation: 5) Assessment of impact of VNS on heart rate variability (HRV) and orthostatic stress in participants with memory impairment. The study will enroll participants via the memory assessment service who have been diagnosed with MCI. The study will enroll 40 participants. All eligible participants will undergo three assessments; one as a baseline assessment of neurocardiovascular health, baseline cognitive tests and baseline blood tests. They will then return for two further visits, one while undergoing active stimulation (active t-VNS) and one while undergoing sham stimulation (sham t-VNS).
Status | Completed |
Enrollment | 40 |
Est. completion date | June 30, 2023 |
Est. primary completion date | June 30, 2023 |
Accepts healthy volunteers | No |
Gender | All |
Age group | N/A and older |
Eligibility | Inclusion Criteria: - Mild Cognitive Impairment as defined by Clinical Dementia Rating Scale Global score of 0.5 - one RBANS index indicating multi-domain amnestic MCI, amnestic MCI or non-amnestic MCI - native English speakers Exclusion Criteria: - significant current depression - uncorrected vision/hearing loss - history of brain surgery - history of epilepsy with seizure event in last year - taking any pharmacological agents known to significantly increase seizure risk - arrhythmia including atrial fibrillation - pacemaker implants - existing left ear deformity or recent ear trauma - alcohol dependence - currently taking DMARDs or immunotherapies |
Country | Name | City | State |
---|---|---|---|
Ireland | Tallaght University Hospital | Dublin |
Lead Sponsor | Collaborator |
---|---|
Tallaght University Hospital |
Ireland,
Type | Measure | Description | Time frame | Safety issue |
---|---|---|---|---|
Primary | Safety of acute t-VNS in participants with MCI - assessed via orthostatic challenge | Orthostatic stress is measured via the active stand test whereby participants lie supine for 5 minutes with beat to beat blood pressure (BP) monitoring. They then stand and BP response to orthostatic challenge is measured. To standardise assessments, they are all taken at 14:00 each day, without nicotine or caffeine consumed that day, and all routine meds are taken as usual each morning. Orthostatic hypotension is defined by consensus as a sustained reduction of systolic blood pressure (SBP) of at least 20 mmHg or diastolic blood pressure (DBP) of 10 mmHg within 3 minutes of standing | acute (less than 60 minutes) | |
Primary | Safety of acute t-VNS in participants with MCI - assessed via structured assessments of adverse events (AEs) and serious adverse events (SAEs) | Likert based questionnaires have been developed to assess for the routine side effects noted in the literature for acute t-VNS treatment including pain, skin discomfort, tingling, headache, tinnitus. These Likert scales are rated 1 to 5 with 1 = worse symptoms and 5 = no symptoms, and will be undertaken after active and sham stimulation. Participants will be given contact details of the principal investigator and study coordinator at the hospital who they can contact if they have concerns or any new symptoms arise. | acute (less than 60 minutes) | |
Primary | Tolerability of acute t-VNS in participants with MCI | Tolerability of the device will be assessed via in-person questionnaires involving Likert-based scales rated 1 to 5 with 1 = poorly tolerable / painful and 5 = no discomfort noted / comfortable | acute (less than 60 minutes) | |
Secondary | Effect of acute t-VNS on associative memory in participants with MCI | The Face Name Association Test is a cross-modal associative memory test involving Face-Name pairs, of which the participant is shown 30 pairs and then asked to recall if they have been shown before, and if so what their name was. t-VNS has been shown to boost associative memory as assessed by this task in cognitively unimpaired older adults, but has not been assessed in those with MCI. Near-infrared spectroscopy (NIRS) assessment will be ongoing during cognitive assessments, and the assessments will be undertaken 3 times, once at baseline, once during sham once during active t-VNS with 7-10 days between assessments | acute (less than 60 minutes) | |
Secondary | Effect of acute t-VNS on inhibitory control in participants with MCI | The Sustained Attention to Response Task (SART) is a computer-based go/no-go task that requires participants to withhold behavioral response to a single, infrequent target (often the digit 3) presented amongst a background of frequent non-targets (0-2, 4-9). There is evidence supporting the role of the SART as a measure of working memory, sustained attention, and impulse/inhibitory control. We will measure participants' response times and accuracy, at baseline, during active and sham t-VNS with near infrared spectroscopy (NIRS) measurements ongoing during task. | acute (less than 60 minutes) | |
Secondary | Effect of acute t-VNS on spatial navigation in participants with MCI | Sea Hero Quest is a multi-platform mobile game designed to help advance the understanding of spatial navigation and 3D navigation, which is one of the first skills lost in dementia. We will measure participants' ability to navigate through 5 pre-specified levels of Sea Hero Quest, specifically speed and accuracy of navigation. Near-infrared specroscopy (NIRS) measurement will be ongoing during assessment and the assessments will be undertaken at baseline, during active and sham t-VNS. | acute (less than 60 minutes) | |
Secondary | Effect of acute t-VNS on heart rate variability in participants with MCI | Heart rate variability (HRV) is an index of the beat- to beat variability between heart beats. Increased vagal tone (and thus vagal action) is generally associated with a lower heart rate and increased HRV. Indices of HRV including SDNN, RMSSD, HF/LF ratio will be obtained during 5 minutes of rest pre -orthostatic stress. Baseline HRV, and HRV during both active t-VNS and sham t-VNS will be obtained for each participant | acute (less than 60 minutes) | |
Secondary | Effect of acute t-VNS on serum and plasma chemokines and cytokines in participants with MCI | Non-invasive VNS has been shown to downregulate inflammatory cytokine release in healthy young participants, but has not been assessed in participants with MCI. We aim to measure a wide array of blood based cytokines and chemokines using the Luminex assay. Serum and plasma samples will be taken at baseline assessment, after acute active t-VNS and sham t-VNS. | acute (less than 60 minutes) | |
Secondary | Utility of t-VNS device in participants with MCI | Participants' objective ability to utilise and troubleshot the t-VNS device will be assessed via modified Kettle test; a brief Occupational Therapy performance-based measure designed to assess cognitive skills in a functional context. | acute (less than 60 minutes) |
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