- ICH GCP
- US Clinical Trials Registry
- Clinical Trial NCT02363504
The Locus Coeruleus and Memory (LOCUS)
Focus on the Locus Coeruleus Network With 7 T MRI: Link to Memory (Dys)Function
The cause of Alzheimer's disease, the most common form of dementia, remains unknown. Neuropathological studies suggest that a small area in the brainstem, the locus coeruleus, might be the site of the onset of the disease. This area is the sole source of noradrenalin to the brain, a neurotransmitter involved in arousal, but also cognitive functions. Animal and pharmacological studies have hinted towards an important role of this area in memory functioning. However, these studies were hampered by the limited spatial resolution, making it hard to clearly localize the locus coeruleus in the brain. New developments in brain imaging allow now to visualize the brain with stunning precision. Furthermore, a non-invasive new stimulation method, transcutaneous vagus nerve stimulation, is believed to excite the locus coeruleus and thereby influencing neuronal networks and memory functioning.
There are three aims in this project:
- To investigate how the functional interaction between the locus coeruleus and other brain areas, in particular the medial temporal lobe areas, during memory processes (encoding, consolidation and retrieval) change with development of Alzheimer's disease.
- To investigate associations between noradrenaline, memory performance and brain functioning. The investigators aim to investigate how acute noradrenalin levels change during the different memory processes and whether or not this is beneficial for performance. Furthermore, the investigators will investigate whether this interaction between noradrenalin, memory performance and brain functioning is different healthy older individuals (n =35) or patients with prodromal Alzheimer's disease (n =35).
- To investigate the underlying neural network changes during transcutaneous vagus nerve stimulation. The investigators will focus on differences in functional connectivity between the locus coeruleus and the medial temporal lobe areas in healthy older individuals and prodromal Alzheimer's disease patients. An experimental condition will be compared with a sham condition in a pseudo-randomized cross-over design.
Study Overview
Status
Conditions
Intervention / Treatment
Study Type
Enrollment (Anticipated)
Contacts and Locations
Study Locations
-
-
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Maastricht, Netherlands
- Recruiting
- Maastricht University
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-
Participation Criteria
Eligibility Criteria
Ages Eligible for Study
Accepts Healthy Volunteers
Genders Eligible for Study
Sampling Method
Study Population
Description
Inclusion Criteria:
For the patients:
- diagnosis of prodromal Alzheimer's disease based on the latest research criteria (clinical assessment at the memory clinic : presence of at least a memory impairment, memory complaints expressed by the patient or informant, no problems in daily life functioning, no dementia and presence of biomarkers
- Clinical Dementia Rating score of 0.5 (
- Mini-Mental State Examination (MMSE) ≥ 23 and being mentally competent (in general, individuals with a MMSE ≥ 18 are considered mentally competent)
- Age: between 60 and 85 years old
- 50% female
- Right-handedness
- Average level of education
- Informed consent before participation in the study
For the healthy older individuals:
- Average neuropsychological test results, in accordance with normative data, corrected for age, education and gender
- No substantial memory complaints (according to the participant)
- Age: between 60 and 85 years old
- 50% female
- Right-handedness
- Average level of education
- Informed consent before participation in the study
Exclusion Criteria:
- Reduced vision
- Psychoactive medication use
- Abuse of alcohol and drugs
- Cognitive impairment due to alcohol/drug abuse or abuse of other substances
- Past or present psychiatric or neurological disorders (major depression, schizophrenia, bipolar disorder, psychotic disorder (or treatment for it), epilepsy, stroke, Parkinson's disease, multiple sclerosis, brain surgery, brain trauma, electroshock therapy, kidney dialysis, Menière's disease, brain infections)
- Major vascular disorders (e.g. stroke)
- Heart diseases or pacemakers
- Contraindications for scanning (e.g. brain surgery, cardiac pacemaker, metal implants, claustrophobia, body tattoos)
Study Plan
How is the study designed?
Design Details
- Observational Models: Case-Control
- Time Perspectives: Other
Cohorts and Interventions
Group / Cohort |
Intervention / Treatment |
---|---|
Healthy older controls
7 Tesla MRI with memory task and non-invasive neurostimulation
|
This is not an intervention, we investigate the neural mechanisms
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Prodromal Alzheimer's disease patients
7 Tesla MRI with memory task and non-invasive neurostimulation
|
This is not an intervention, we investigate the neural mechanisms
|
What is the study measuring?
Primary Outcome Measures
Outcome Measure |
Measure Description |
Time Frame |
---|---|---|
Blood Oxygen Level Dependent (BOLD) response during a memory task
Time Frame: 60 minutes
|
BOLD response contrasts during encoding and retrieval. For encoding: comparing neutral versus emotional, comparing old versus prodromal AD and the interaction emotional level by group. For retrieval: correctly remembered versus those incorrectly remembered; neutral versus emotional faces; lures, mistakes and hits. These contrasts will be investigated comparing both groups. BOLD responses during the memory task will also be compared across sessions (sham versus stimulation) for both groups. Consolidation: task-free, so the BOLD response in the locus coeruleus will be correlated with the BOLD response in any other voxel of the grey matter of the brain over time (seed-based resting-state analyses). |
60 minutes
|
Performance on the memory task
Time Frame: 60 minutes
|
Mean reaction times and accuracy levels during encoding and retrieval for emotional and neutral face-name associations and for old and prodromal AD patients. Mean reaction times and accuracy levels will also be compared across sessions: sham versus stimulation for both groups Mean reaction times and accuracy levels will also be correlated with BOLD responses during the memory task. |
60 minutes
|
Noradrenalin levels during the memory task
Time Frame: 60 minutes
|
Noradrenalin levels will be measured 7 times: double baseline, before encoding, after encoding, before retrieval, after retrieval and follow-up. Noradrenalin levels will be correlated with BOLD responses during the memory task. |
60 minutes
|
Secondary Outcome Measures
Outcome Measure |
Measure Description |
Time Frame |
---|---|---|
Grey matter volume of the locus coeruleus
Time Frame: 5 mintues
|
manual measurement of the number of voxels of the locus coeruleus: to compare groups
|
5 mintues
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shape properties of the locus coeruleus
Time Frame: 5 minutes
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Correspondence of the location between triangle meshes (shape of the locus coeruleus) will be compared between groups
|
5 minutes
|
Performance on neuropsychological tests
Time Frame: 30 minutes
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Total score on the mini-mental state examination, fluency test, letter-digit-substitution test, concept shifting task, stroop color word test and the word learning task will be compared across groups. For the stroop color word task and the concept shifting task we will also compare reaction times between both groups. These scores will be correlated to the grey matter volume of the locus coeruleus and the shape properties of the locus coeruleus. |
30 minutes
|
Other Outcome Measures
Outcome Measure |
Measure Description |
Time Frame |
---|---|---|
Basic descriptives
Time Frame: 15 minutes
|
gender, date of birth, socio-economic status, educational level, medical history, medication use: will be used descriptively
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15 minutes
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Vascular measurements
Time Frame: 15 min
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Mean arterial blood pressure, cardiovascular risk factors and vascular pathology will be assessed descriptively and could also lead to exclusion of participants.
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15 min
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Alpha-peak frequency
Time Frame: 30 minutes
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the individual mean alpha-peak frequency will be assessed with rest EEG to determine stimulation parameters.
|
30 minutes
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Side effects
Time Frame: 10 min
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via a questionnaire we will collect the level of side effects after stimulation (scale 1-5)
|
10 min
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Blood pressure and heart rate
Time Frame: 20 minutes
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Blood pressure and heart rate will be measured before and after the sessions (seated and standing) in order to monitor response to the stimulation.
|
20 minutes
|
Collaborators and Investigators
Collaborators
Investigators
- Study Director: Frans Verhey, Prof, Maastricht University Medical Centre
Study record dates
Study Major Dates
Study Start (Actual)
Primary Completion (Anticipated)
Study Completion (Anticipated)
Study Registration Dates
First Submitted
First Submitted That Met QC Criteria
First Posted (Estimate)
Study Record Updates
Last Update Posted (Actual)
Last Update Submitted That Met QC Criteria
Last Verified
More Information
Terms related to this study
Additional Relevant MeSH Terms
Other Study ID Numbers
- NL51297.068.14
This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.
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