- ICH GCP
- US Clinical Trials Registry
- Clinical Trial NCT01555827
Retinal Neurodegenerative Signs in Alzheimer's Diseases (SIGNAL)
A few studies suggest that patients suffering from neurodegenerative diseases (such a multiple sclerosis or Alzheimer's disease (AD)) show decreased thickness of the retinal nerve fiber layer (RNFL), indicating axonal degeneration. High-definition spectral domain optical coherence tomography (SD-OCT), performed without radiation in a few seconds per eye, offers a precise and standardized estimation of this parameter, which could constitute a biomarker for cerebral axonal degeneration. These RNFL deficits might even be the earliest sign of AD, prior to damage of the hippocampal region that impacts memory.
Besides, some associations of AD with some degenerative diseases of the eye (glaucoma, microvascular abnormalities, age-related macular degeneration (AMD)) have also been reported.
It therefore seems interesting to determine whether RNFL thickness, and other ocular parameters, may give some indications for a better detection of AD and cognitive decline in the elderly.
Study Overview
Status
Conditions
Intervention / Treatment
Study Type
Enrollment (Actual)
Phase
- Not Applicable
Contacts and Locations
Study Locations
-
-
-
Bordeaux, France, 33000
- CHU Bordeaux - Hôpital Pellegrin
-
-
Participation Criteria
Eligibility Criteria
Ages Eligible for Study
Accepts Healthy Volunteers
Genders Eligible for Study
Description
Inclusion Criteria:
- Inclusion criteria for AD cases:
- Diagnosis of probable AD, defined according to the NINCDS-ARDRA criteria51
- Light to moderate severity of the disease, defined by a MMSE score >10 (global evaluation of cognition)
- Patient aged 50 years or more
- Patient benefiting from social insurance
Inclusion criteria for controls:
- Absence of suspicion of dementia, based on normal performance according to age and educational level at neuropsychological testing defined as:
- Free recall ≥17 and total recall ≥40 for the Free and Cued Selective Reminding Test (Grober and Buschke test 52) MMSE ≥ norm for age and educational level (defined by mean - 1 SD)
- Isaac's set test ≥ norm for age and educational level (defined by mean - 1 SD)
- Matched to age and gender of the cases
- Patient benefiting from social insurance
Exclusion Criteria:
Exclusion criteria for all patients :
- History of Parkinson's disease or other neurodegenerative disorder
- History of Horton's disease
- History of inflammatory neuropathies (in particular Devic's disease, multiple sclerosis)
- History of vascular ischemic neuropathies and chronic intracranial hypertension
- History of pituitary tumors
- Presence of diseases (systemic and/or ocular diseases) or behavioural or cognitive symptoms incompatible with eye examination
- Known diabetes
- Person under tutorship or curatorship, person unable to express consent
Additional exclusion criteria for AD cases:
- Dementia of other cause than AD
- Severe AD, defined by MMSE score ≤ 10
Additional exclusion criteria for controls:
- Presence of dementia, of whatever cause
Study Plan
How is the study designed?
Design Details
- Primary Purpose: Diagnostic
- Allocation: Non-Randomized
- Interventional Model: Parallel Assignment
- Masking: None (Open Label)
Arms and Interventions
Participant Group / Arm |
Intervention / Treatment |
---|---|
Active Comparator: Control
|
The following examinations will be performed, after pupil dilation:
The following informations will be collected through a standardized questionnaire, administered face-to-face during the inclusion visit, or at the moment of the verification of eligibility criteria:
|
Experimental: Alzheimer Disease
|
The following examinations will be performed, after pupil dilation:
The following informations will be collected through a standardized questionnaire, administered face-to-face during the inclusion visit, or at the moment of the verification of eligibility criteria:
|
What is the study measuring?
Primary Outcome Measures
Outcome Measure |
Time Frame |
---|---|
RNFL thickness measured on a peri-papillary scan of SD-OCT examination.
Time Frame: inclusion visit (day0)
|
inclusion visit (day0)
|
Secondary Outcome Measures
Outcome Measure |
Time Frame |
---|---|
Glaucomatous optic nerve damage observed on colour photographs (cup/disc ratio)
Time Frame: inclusion visit (day0)
|
inclusion visit (day0)
|
Retinal microvascular abnormalities (microaneurysms, micro-hemorrhage, cotton wool spots, arteriovenous nicking), observed on retinal colour photography
Time Frame: inclusion visit (day0)
|
inclusion visit (day0)
|
Macular abnormalities observed on retinal colour photographs (drusen, pigmentary abnormalities, neovascular AMD, atrophic AMD, other retinal diseases)
Time Frame: inclusion visit (day0)
|
inclusion visit (day0)
|
Macular abnormalities observed on macular scans in SD-OCT (drusen, pigmentary abnormalities, neovascular AMD, atrophic AMD, epiretinal membranes, other retinal diseases).
Time Frame: inclusion visit (day0)
|
inclusion visit (day0)
|
Macular abnormalities observed in autofluorescence imaging (increased autofluorescence, decreased autofluorescence, reticular drusen, atrophic AMD, other abnormalities)
Time Frame: inclusion visit (day0)
|
inclusion visit (day0)
|
Macular and peripheral abnormalities diagnosed in wide-field retinal imaging
Time Frame: inclusion visit (day0)
|
inclusion visit (day0)
|
Retinal blood flow velocity (RFI)
Time Frame: inclusion visit (day0)
|
inclusion visit (day0)
|
Intraocular pressure
Time Frame: inclusion visit (day0)
|
inclusion visit (day0)
|
axial length
Time Frame: inclusion visit (day 0)
|
inclusion visit (day 0)
|
Collaborators and Investigators
Sponsor
Investigators
- Principal Investigator: Jean-François KOROBELNIK, Pr, University Hospital, Bordeaux, France
- Study Chair: Delcourt Cécile, Dr, ISPED, bordeaux, France
Study record dates
Study Major Dates
Study Start (Actual)
Primary Completion (Actual)
Study Completion (Actual)
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
- CHUBX2011/19
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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