RecruitingNCT03761381

OCT Angiography and NRAI in Dementia

Using Optical Coherence Tomography and Noninvasive Retinal Amyloid Imaging to Capture Retinal Changes Associated With Dementia

Sponsor

Oregon Health and Science University

Enrollment

20 participants

Start Date

Sep 14, 2018

Study Type

OBSERVATIONAL

Conditions

Dementia Alzheimer Disease Mild Cognitive Impairment

Summary

The primary goals of this study are to use optical coherence tomography (OCT) angiography (blood vessel mapping) to: 1. Detect retinal blood vessel and blood flow changes in participants with dementia. 2. Detect amyloid protein deposits in the retinas of participants with dementia.

Eligibility

Min Age: 55 Years

Inclusion Criteria11

Physician-confirmed diagnosis of probable Alzheimer's disease
Mild dementia, as defined by score of 20 or greater on the Mini-Mental State Exam, or score of 15 or greater on the Montreal Cognitive Assessment, or Clinical Dementia Rating Scale score of 1.
Age older than 55 years.
Able to comply with study procedures
Corrected visual acuity at least 20/400 in either eye.
Has a legally authorized representative who can sign study consent form and accompany the participant to the OCT study visit.
Age older than 55 years
Able to comply with study procedures
Able to maintain stable fixation for OCT imaging
Corrected visual acuity of at least 20/40 in either eye
Dementia-free, as defined by score of 24 or greater on the Mini-Mental Status Exam, or a score of 18 or greater on the Montreal Cognitive Assessment, or Clinical Dementia Rating of \<1.0.

Exclusion Criteria10

Non-Alzheimer's disease related primary neurologic disease affecting the central nervous system (i.e. multiple sclerosis, Parkinson's disease)
Evidence on ophthalmological exam within the last year of other ocular diseases or pathology that would confound the assessment of dementia (e.g. glaucoma, diabetic or hypertensive retinal disease, amblyopia, etc.)
Media opacity such as cataract, corneal scar, or vitreous opacity that could interfere with retinal imaging.
Previous intraocular surgery except for uncomplicated cataract extraction with posterior chamber intraocular lens implantation
Inability to maintain stable fixation for OCT imaging or provide informed consent
Spherical equivalent refractive error greater than +3 or -7 diopters, or astigmatism magnitude of greater than 2 diopters.
Diabetes for more than 10 years or hemoglobin A1C level of \> 10 within the 180 days prior to OCT scanning.
Uncontrolled hypertension. : SBP \> 170 or DBP \> 100
Arrhythmia: irregular pulse, or heart rate not between 50 and 110 beats per minute
Pregnancy or breast feeding.

Interventions

DEVICEOptical Coherence Tomography Angiography (OCTA) Imaging

Optical coherence tomography is a non-invasive imaging technology that provides cross-sectional images of tissues in micron-scale resolution. The angiography component of this device allows for evaluation of blood vessel and blood flow changes in the eye. The Solix device with AngioVue software will be used to detect these blood vessel and flow changes as well as protein deposits in the retinal layers.

DEVICENoninvasive Retinal Amyloid Imaging (NRAI)

The Spectralis will be used for NRAI. This system uses a special light source and optical filters to detect fluorescence of amyloid proteins in the eye.