Choroidal vascularity index: an enhanced depth optical coherence tomography-based parameter to determine vascular status in patients with proliferative and non-proliferative macular telangiectasia


Karasu B., ÇELEBİ A. R. C.

INTERNATIONAL OPHTHALMOLOGY, 2021 (Journal Indexed in SCI) identifier identifier

  • Publication Type: Article / Article
  • Volume:
  • Publication Date: 2021
  • Doi Number: 10.1007/s10792-021-01917-8
  • Title of Journal : INTERNATIONAL OPHTHALMOLOGY

Abstract

Key messages The pathogenesis of subretinal neovascularization (SRNV) due to macular telengiectasia (MacTel 2) has not fully elucidated. This optical coherence tomography (OCT)-based method can provide better understanding of the pathogenesis of SRNV due to MacTel 2. Purpose To evaluate the choroidal vascular index (CVI) through optical coherence tomography (OCT) on eyes with proliferative macular telangiectasia type 2 (MacTel 2) or non-proliferative MacTel 2, and in healthy individuals. Methods Macular enhanced depth imaging OCT scans on 42 eyes of 21 patients with non-proliferative MacTel 2, on 32 eyes of 20 patients with proliferative MacTel 2, and on 38 eyes of 32 control patients were analyzed by adjusting for age-gender-axial length. Proliferative MacTel 2 was diagnosed when subretinal neovascularization (SRNV) was simultaneously observed in the non-proliferative phase. Binarization methods of ImageJ software were used to analyze images, and total choroid area (TCA), luminal area (LA) and stromal area (SA) were obtained. CVI was characterized as the ratio of LA to TCA. Results The mean TCA and SA were significantly higher in group 1 and group 2 when compared with group 3 (3.36 +/- 0.29 mm(2) vs. 3.27 +/- 0.76 mm(2) vs. 2.49 +/- 0.24 mm(2), p < 0.001; 1.15 +/- 0.31 mm(2) vs. 1.10 +/- 0.69 mm(2) vs. 0.35 +/- 0.23 mm(2), respectively; p < 0.001). Although LA was relatively higher in group 1 and group 2 than group 3, no statistically significant difference was observed (2.22 +/- 0.14 mm(2) vs. 2.17 +/- 0.15 mm(2) vs. 2.13 +/- 0.21 mm(2)) (p = 0.088). CVI was significantly lower in group 1 than other groups (0.65 +/- 0.01 vs 0.67 +/- 0.02 vs 0.68 +/- 0.02) (p < 0.001). Conclusion As an OCT screening method, CVI may be used to assess the vascular status of the choroid on the eyes which are naive for or were exposed to SRNV secondary to MacTel 2, and to elucidate the pathogenesis of this disease.