MIMA Pilot Study: MIcrostructure of the Medial Temporal Lobe in Early Alzheimer's Disease

NCT ID: NCT06099587

Last Updated: 2024-07-08

Basic Information

• Recruitment Status: RECRUITING
• Clinical Phase: NA
• Total Enrollment: 50 participants
• Study Classification: INTERVENTIONAL
• Study Start Date: 2024-07-02
• Study Completion Date: 2027-03-31

Brief Summary

Patients with Mild Cognitive Impairment (MCI) or Subjective Cognitive Decline (SCD) may or may not develop Alzheimer's disease (AD) dementia. Yet identifying patients at risk is crucial: delaying the onset of the disease by 5 years could reduce prevalence by 50%. To achieve this, we need affordable biomarkers combined with clinically meaningful assessment tools. Current approaches (cognition, imaging or Tau and Amyloid peptide assays) lack precision or specificity (e.g., age-related memory deficits) and involve invasive and costly procedures, sometimes inaccessible in France (e.g., the "AT(N)" framework). Recently, quantitative diffusion MRI (dMRI) has identified in-vivo gray matter microstructural changes linked to hyperphosphorylated Tau protein, which are of great diagnostic value. Still, we ignore whether and how these changes are responsible for early memory impairment in AD. The MIMA-P project will combine multi-compartment models of the high-resolution diffusion signal with a cognitive assessment of memory based on recent models of medial temporal lobe function to assess the relevance of a new affordable, rapid and non-invasive early marker of the disease.

Detailed Description

The study will combine multi-compartment models (e.g. Archer et al., 2020; Parker et al., 2020) of high-resolution diffusion MRI within medial temporal lobes regions of interest defined through the ASHS algorithm (Yushkevich et al., 2015), with theoretically driven cognitive assessment medial temporal lobes functions. The '4 mountains test' and the 'Memory entities' test will allow specific probing of hippocampal and rhinal cortices functions, respectively (Hartley et al., 2007; Besson et al., 2020).

25 patients with 'subjective cognitive decline-plus' (hereafter 'SCD', criteria of Jessen et al., 2014) and 25 patients with mild neurocognitive impairment due to Alzheimer's disease (hereafter 'MCI', criteria of Albert et al., 2011) matched for gender, socio-professional category and level of education. The 25 healthy volunteers required have already been included in a different study.

Conditions

Alzheimer Disease, Early Onset

Study Design

• Allocation Method: NON_RANDOMIZED
• Intervention Model: PARALLEL
• Primary Study Purpose: DIAGNOSTIC
• Blinding Strategy: NONE

Study Groups

SCD+

Patients with subjective cognitive decline-plus due to Alzheimer's disease (or "DCS" in french)

Group Type: EXPERIMENTAL

high-resolution diffusion MRI

Intervention Type: DIAGNOSTIC_TEST

The study will combine multi-compartment models (e.g. Archer et al., 2020; Parker et al., 2020) of high-resolution diffusion MRI within medial temporal lobes regions of interest defined through the ASHS algorithm (Yushkevich et al., 2015), with theoretically driven cognitive assessment medial temporal lobes functions. The '4 mountains test' and the 'Memory entities' test will allow specific probing of hippocampal and rhinal cortices functions, respectively (Hartley et al., 2007; Besson et al., 2020).

MCI

Patients with mild neurocognitive impairment due to Alzheimer's disease (or "TCL" in french)

Group Type: EXPERIMENTAL

high-resolution diffusion MRI

Intervention Type: DIAGNOSTIC_TEST

The study will combine multi-compartment models (e.g. Archer et al., 2020; Parker et al., 2020) of high-resolution diffusion MRI within medial temporal lobes regions of interest defined through the ASHS algorithm (Yushkevich et al., 2015), with theoretically driven cognitive assessment medial temporal lobes functions. The '4 mountains test' and the 'Memory entities' test will allow specific probing of hippocampal and rhinal cortices functions, respectively (Hartley et al., 2007; Besson et al., 2020).

Interventions

high-resolution diffusion MRI

The study will combine multi-compartment models (e.g. Archer et al., 2020; Parker et al., 2020) of high-resolution diffusion MRI within medial temporal lobes regions of interest defined through the ASHS algorithm (Yushkevich et al., 2015), with theoretically driven cognitive assessment medial temporal lobes functions. The '4 mountains test' and the 'Memory entities' test will allow specific probing of hippocampal and rhinal cortices functions, respectively (Hartley et al., 2007; Besson et al., 2020).

Intervention Type: DIAGNOSTIC_TEST

Other Intervention Names

Memory tests

Eligibility Criteria

Inclusion Criteria

• aged between 50 and 80
• native French speaking
• right-handed
• with a level of education equal to or higher than the Certificat d'Etudes Primaires (primary school leaving certificate)
• free of any medical or psychiatric condition likely to interfere with cognition, other than a diagnosis of SCD / MCI
• affiliated with a social security scheme
• having received oral and written information abou the protocol and having signed a consent form to participate in this research
• patients with 'subjective cognitive decline-plus' (hereafter 'SCD', criteria of Jessen et al., 2014) or patients with mild neurocognitive impairment due to Alzheimer's disease (hereafter 'MCI', criteria of Albert et al., 2011)

Exclusion Criteria

• contraindications to MRI : Abdominal circumference + upper limbs stuck to the body > 200 cm; Implantable pacemaker or defibrillator; Neurosurgical clips; Cochlear implants ; Neural or peripheral stimulator; Intra-orbital or encephalic metallic foreign bodies; Endoprostheses fitted less than 4 weeks ago and osteosynthesis devices fitted less than 6 weeks ago; Claustrophobia.
• sensory deficit interfering with experimental tests
• pregnant or breast-feeding women
• adults under legal protection (safeguard of justice, curatorship, guardianship), persons deprived of liberty
• 7-items modified Hachinski ischemic score >2 (Hachinski et al., 2012)
• Dementia (McKhann et al., 2011)

• Minimum Eligible Age: 50 Years
• Maximum Eligible Age: 80 Years
• Eligible Sex: ALL
• Accepts Healthy Volunteers: No

Sponsors

Rennes University Hospital

OTHER

Sponsor Role: lead

Responsible Party

Responsibility Role: SPONSOR

Principal Investigators

Pierre-Yves JONIN, PhD

Role: PRINCIPAL_INVESTIGATOR

CHU Rennes

Locations

CHU Rennes

Rennes, , France

Site Status: RECRUITING

Countries

France

Central Contacts

Pierre-Yves JONIN, PhD

Role: CONTACT

pierreyves.jonin@chu-rennes.fr

299284321 ext. +33

Isabelle LEROYER

Role: CONTACT

isabelle.leroyer@chu-rennes.fr

299289747 ext. +33

Facility Contacts

Pierre-Yves JONIN, PhD

Role: primary

Other Identifiers

35RC23_8900_MIMA-P

Identifier Type: -

Identifier Source: org_study_id