Co-LEsions in Alzheimer Disease and Related Disorders (CLEM)

Civil Hospices of Lyon

Status

Unknown

Conditions

Alzheimer's Disease

Cerebrovascular Disease

Lewy Body Disease

Treatments

Radiation: SPECT-DaTscan

Study type

Interventional

Funder types

Other

Identifiers

NCT02052947

2013.795

Details and patient eligibility

About

One of the crucial challenges for the future of Alzheimer's disease (AD) therapeutic approaches in elderly is to target the main pathological process responsible for disability and dependency. However, a progressive cognitive impairment occurring after the age of 70 is often related to mixed lesions of neurodegenerative and vascular origins. Whereas young patients are mostly affected by pure lesions, aging favors the occurrence of co-lesions of AD, vascular and Lewy body types. Pure DLB (Dementia with Lewy Body) and AD are distinct disorders but they often coexist in old age patients, the Abeta pathology of DLB/AD cases being different to that observed in patients with AD alone. Vascular dementia (VD) and AD with cerebrovascular disease (AD+CVD) are the leading causes of dementia next to AD alone. Lack of consensus persists about the diagnosis criteria for VD and AD+CVD, due in part to their clinical, pathological heterogeneity and the multiple pathological subtypes.

We do not know the precise role and weight of each brain lesion type in the disability progression in elderly. To target the actual pathological process, we need to disclose the functional weight of AD, Lewy body and vascular lesion types in elderly. Most of the studies report on functional and clinical abnormalities in patients with pure pathologies. Thus, co-morbid processes involved in the transition from an independent functional status to disability in the elderly with co-lesions still remain to be elucidated. Neuropathological examination often performed at late stages cannot answer this question at mild or moderate stages.

Brain MRI, Single Photon Emission Computed Tomography (SPECT) with DaTscan® and CSF biomarkers help routinely in performing the diagnosis of pure or mixed lesions responsible for dementia. The topography of the atrophy in MRI helps to provide information about the etiological diagnosis. Medial temporal lobe atrophy on MRI has good discriminatory power for AD compared to DLB and VD in pathologically confirmed cases. DaTscan® SPECT presents with good sensitivity and specificity at early stages of DLB. The good diagnosis value of CSF biological markers has led recently to their inclusion in the research diagnosis criteria of AD. Low Aβ1-42 and high levels of total tau and hyperphosphorylated tau isoforms appear to be the most sensitive and specific CSF biomarkers. Aβ1-42 is lowered in AD, as well as in other neurodegenerative diseases like DLB, VD. The combination of MRI, particularly medial temporal atrophy measures and vascular lesions on FLAIR MRI sequences, SPECT and CSF biomarkers seem to be of incremental value for the diagnosis AD, VD, DLB and mixed profiles.

The aim of this study is to identify the biomarkers (MRI, SPECT-DaTscan® and CSF), and their combination, that are the most predictive of functional disability in elderly presenting with a progressive cognitive decline related to AD, DLB, VD and all mixed patterns.

Enrollment

214 estimated patients

Sex

All

Ages

70+ years old

Volunteers

No Healthy Volunteers

Inclusion criteria

Male or female subject aged over 70 years
Out-patient consulting at one of the Memory Centres participating to the study
Patients meeting diagnosis criteria for dementia due to Alzheimer's disease (McKhann, Knopman et al. 2011), vascular dementia (NINCDS-AIREN criteria, Roma´n, G. C., Tatemichi, T. K., Erkinjuntti, T., et al. (1993), Lewy body disease (McKeith, Dickson et al. 2005), and patients presenting with mixed signs and symptoms suggesting a combination of these diagnosis
Mild or moderate dementia stage (MMSE criteria > 15)
Being affiliated to health insurance
Patient with sufficient visual, auditory and oral and written French language skills to complete the clinical and neuropsychological evaluations
Accompanied by a close relation in sufficient contact with the subject to assess their dependency

Exclusion criteria

Patients with psychiatric disorders (Axe 1 DSMIV (Diagnostic and Statistical Manual of Mental Disorders) disease) excepted patients with depressive or anxious disorders stabilized for more than 3 months
Patients taking any neuroleptic psychotropic medication
Patients taking other psychotropic medication, with the exception of any antidepressant, hypnotic, anxiolytic, acetylcholinesterase inhibitors or memantine which has been prescribed and stabilised for more than 3 months
Patients with signs and symptoms suggestive of dementia related to other diseases than AD, vascular and Lewy diseases, or mixed forms
Patients with other neurological diseases
Patients with progressive and unstable pathologies which could interfere with the variables under consideration
Deafness or blindness which could compromise evaluation of the patient
Patients being not able to undergo DaTscan®: with moderate or severe hepatic or renal impairment, a known hypersensitivity to ioflupane or any of the excipients
Patient living in an institution
Patient meeting brain MRI exclusion criteria (pacemakers, aneurysm clips, artificial heart valves, ear implants, metal fragments or foreign objects in the eyes, skin, or body) or refusing MRI
Patient being under guardianship