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Metabolic Mapping to Measure Retinal Metabolism

2014-08-27 03:42:09 | BioPortfolio

Summary

This study will test whether a new non-invasive technique can quickly and precisely measure retinal metabolism (the amount of energy retinal cells use). The retina is the part of the eye that sends information to the brain.

Participants in current NEI studies who have age-related macular degeneration (AMD), diabetic retinopathy, or von Hippel-Landau disease may be eligible for this study. Healthy volunteers will participate as controls. Patients with AMD must be 60 years of age or older; those with VHL disease or diabetic retinopathy must be 18 or older.

Participants undergo the tests and procedures required in the NEI study in which they previously enrolled. In addition, for the current study, they undergo metabolic mapping. For this procedure, the subject's eyes are dilated, and different amounts of low-level light are shone into the eye to see how different cells respond with changes in metabolism. Measurements are taken while the subject breathes room air and while he or she breathes medical grade oxygen for about 1 minute. The entire procedure takes about 15 minutes.

Description

Background. Alterations in retinal metabolism are associated with blinding conditions and vision loss. We propose to apply a non-invasive in vivo retinal imaging system to investigate key physiologic processes affecting retinal metabolism. The imaging system is designed to quantify and characterize the topology of retinal metabolism in 3-dimensional space across 40--130 picosecond time periods and allows dynamic measurement of physiologically relevant events.

Objectives. The primary objectives of our study are to: (1) evaluate the utility of this system in a clinical setting; and (2) examine variation in retinal metabolism within retinal cell subtypes under environmental conditions optimized to support this metabolism. The working hypothesis of our first objective is that the imaging system will be easily and efficiently implemented in a clinical setting and will yield stable and repeatable results. The working hypothesis for our second objective is that people with or at high risk for progression to sight threatening retinal disease will exhibit different metabolic profiles than an age- and sex-matched disease-free comparison group. Their peers with less severe disease may exhibit differences with severe diseased and non-diseased groups. The long-term goal of the project is to address the following research questions: Are metabolic profiles generated by the imaging system effective for determining presence and severity of retinal diseases?; and if so, are these metabolic profiles useful in identifying people at risk for progression to sight threatening forms of retinal diseases?

Study Population. We will first apply the systems in 3 groups of 10 people exhibiting a range of severity in retinal diseases that influence retinal metabolism; these diseases are: age-related macular degeneration (AMD); diabetic retinopathy (DR); and von-Hippel-Lindau (VHL) disease.

Design. Cross-sectional sampling design. If the system yields accurate, stable, and repeatable results it will be applied in longitudinal studies to evaluate prognostic utility for estimating the risk of progression to sight-threatening AMD, DR, or VHL disease.

Outcome Measures. The magnitude and 3-D topographic profile of fluorescence anisotropy values across physiologically meaningful time periods for a 20 degree field centered on the macula. Fluorescence anisotropy of our system provides a measure of retinal metabolism.

Study Design

Allocation: Non-Randomized, Control: Uncontrolled, Endpoint Classification: Efficacy Study, Intervention Model: Single Group Assignment, Masking: Open Label, Primary Purpose: Diagnostic

Conditions

Macular Degeneration

Intervention

Feasibility Study - Imaging System

Location

National Institutes of Health Clinical Center, 9000 Rockville Pike
Bethesda
Maryland
United States
20892

Status

Recruiting

Source

National Institutes of Health Clinical Center (CC)

Results (where available)

View Results

Links

Published on BioPortfolio: 2014-08-27T03:42:09-0400

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Medical and Biotech [MESH] Definitions

A form of MACULAR DEGENERATION also known as dry macular degeneration marked by occurrence of a well-defined progressive lesion or atrophy in the central part of the RETINA called the MACULA LUTEA. It is distinguishable from WET MACULAR DEGENERATION in that the latter involves neovascular exudates.

A technique of diagnostic imaging of RETINA or CORNEA of the human eye involving the measurement and interpretation of polarizing ELECTROMAGNETIC WAVES such as radio or light waves. It is helpful in the diagnosis of GLAUCOMA; MACULAR DEGENERATION; and other retinal disorders.

A retrogressive pathological change in the retina, focal or generalized, caused by genetic defects, inflammation, trauma, vascular disease, or aging. Degeneration affecting predominantly the macula lutea of the retina is MACULAR DEGENERATION. (Newell, Ophthalmology: Principles and Concepts, 7th ed, p304)

Specialized ophthalmic technique used in the surgical repair and or treatment of disorders that include retinal tears or detachment; MACULAR HOLES; hereditary retinal disease; AIDS-related retinal infections; ocular tumors; MACULAR DEGENERATION; DIABETIC RETINOPATHY; and UVEITIS.

A form of RETINAL DEGENERATION in which abnormal CHOROIDAL NEOVASCULARIZATION occurs under the RETINA and MACULA LUTEA, causing bleeding and leaking of fluid. This leads to bulging and or lifting of the macula and the distortion or destruction of central vision.

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