Early and Late Treatment Influence on Chorioretinal Microvasculature in Vogt-Koyanagi-Harada Patients Using Optical Coherence Tomography Angiography.

Abstract

To study the impact of early and late treatment on chorioretinal microvasculature in Vogt-Koyanagi-Harada (VKH) disease using optical coherence tomography angiography (OCTA). A total of 103 patients with VKH disease were divided into early (group 1, starting treatment within 2months after disease onset) and late (group 2, starting treatment 2months after disease onset) treatment groups. Flow area (FA) and vessel density (VD) of the retinal superficial vascular complex (SVC) and deep vascular complex (DVC), FA of the choriocapillaris, three-dimensional choroidal vascular volume (CVV), and choroidal vascularity index (CVI) were analyzed and compared to 103 healthy individuals. The relationship between the final best-corrected visual acuity (BCVA) and the aforementioned parameters was also analyzed. FA of the SVC (all P < 0.05, except 0-1mm P = 0.087), DVC (all P < 0.05), choriocapillaris (1-2.5mm P = 0.033), and CVV (all P < 0.05) were lower in group 2 as compared to group 1. Compared to healthy controls, FA of the SVC (all P < 0.001, except 0-1mm P = 0.104) and DVC (all P < 0.05), VD of the SVC (1-2.5mm P = 0.001) and DVC (1-5mm P = 0.003, 2.5-5mm P < 0.001), FA of the choriocapillaris (all P < 0.05), and CVV (total area P = 0.049, 1-5mm P = 0.045, 2.5-5mm P = 0.041) were lower in group 2, while FA (all P < 0.05, except 0-1mm P = 0.925) and VD (1-5mm P = 0.003, 2.5-5mm P = 0.004) of the DVC and FA of the choriocapillaris (total area P = 0.007, 0-1mm P < 0.001, 1-2.5mm P = 0.007) were lower in group 1. There was no significant difference concerning CVI among groups (all P > 0.05). FA of the SVC, DVC, and choriocapillaris and VD of DVC and CVI were negatively associated with the final logarithm of the minimum angle of resolution BCVA. Patients with VKH disease who are treated within 2 months of disease onset showed a better chorioretinal microvascular outcome as defined by OCTA compared to those treatedlate. Our study employs OCTA to design three-dimensional metrics for the retina and choroid, bridging the gap between traditional two-dimensional OCTA findings and enhanced clinical outcomes for patients with VKH disease.