Differences in macular capillary parameters between healthy black and white subjects with Optical Coherence Tomography Angiography (OCTA)


Autoři: Lindsay Y. Chun aff001;  Megan R. Silas aff002;  Rose C. Dimitroyannis aff002;  Kimberly Ho aff002;  Dimitra Skondra aff002
Působiště autorů: University of Chicago Pritzker School of Medicine, Chicago, IL, United States of America aff001;  Department of Ophthalmology and Visual Science, University of Chicago Medical Center, Chicago, IL, United States of America aff002;  University of Chicago, Chicago, IL, United States of America aff003;  J. Terry Ernest Ocular Imaging Center, University of Chicago Medical Center, Chicago, IL, United States of America aff004
Vyšlo v časopise: PLoS ONE 14(10)
Kategorie: Research Article
doi: 10.1371/journal.pone.0223142

Souhrn

Purpose

To investigate if there are differences in macular capillaries between black and white subjects using optical coherence tomography angiography (OCTA) and identify potential factors underlying the epidemiologically-based higher vulnerability of black populations to diabetic retinopathy (DR).

Methods

This prospective, observational cross-sectional study included 93 eyes of 47 healthy subjects with no medical history and ocular history who self-identified as black or white and were matched for age, sex, refractive error, and image quality. Subjects underwent OCTA imaging (RTVue-XR Avanti) of the superficial (SCP) and deep (DCP) capillary plexuses and choriocapillaris. AngioAnalytics was used to analyze vessel density (VD) and choriocapillaris % blood flow area (BFA) in the 1mm-diameter fovea, parafovea, and 3mm-diameter circular area including the fovea and parafovea (3x3mm image). Foveal avascular zone (FAZ) was also analyzed. Linear mixed models were used to evaluate for differences between the study groups.

Results

Compared to the white subjects in this study, black subjects were found to have: lower foveal VD in the SCP (p<0.05); lower VD in the parafovea and in the 3x3mm image in the DCP (p<0.05); larger FAZ in SCP and DCP (p<0.05); and decreased choriocapillary BFA in the area underlying the fovea, parafovea, and 3x3mm image (p<0.05).

Conclusion

In our study, our black subjects had decreased macular capillary vasculature compared to matched white subjects, even in early adulthood and the absence of any systemic or ocular conditions. To our knowledge, this is the first report showing that retinal and choriocapillary vascular differences may contribute to racial disparities in vulnerability to DR.

Klíčová slova:

Blood flow – Diabetes mellitus – Ethnic epidemiology – Eyes – Retina – Retinal vessels – Fovea centralis – Capillaries


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