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Differential microvascular assessment of retinal vein occlusion with coherence tomography angiography and fluorescein angiography: a blinded comparative study

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Abstract

Purpose

To compare the imaging of retinal vein occlusion (RVO) with optical coherence tomography angiography (OCTA) and fluorescein angiography (FA) and evaluate their roles in clinical management.

Methods

RVO patients who underwent imaging with both FA and OCTA from 1 June 2015–31 December 2015 were enrolled. An independent retinal specialist blinded from patient identity assessed the FA and OCTA reports. The pixel counting technique was used for FAZ size measurement. A significant level of p < 0.05 was taken for correlation and agreement analysis.

Results

On OCTA, the mean FAZ size was 0.382 ± 0.152 mm2 and 0.606 ± 0.136 mm2 for the superficial and deep retinal layers, respectively, with significant correlation (p = 0.004). On FA, the mean FAZ size was 0.352 ± 0.158 mm2, better correlated with OCTA at the superficial (p = 0.062) than the deep retinal layer (p = 0.122). Between FA and OCTA, good agreement was found for microaneurysms (100%, p = 0.001) and venous congestion (83.33%, p = 0.028), but not capillary non-perfusion (p = 0.217) and venous tortuosity (p = 0.546). OCTA also revealed more capillary non-perfusion than FA (91.67 vs. 58.33%). The presenting best-corrected visual acuity was significantly correlated with capillary non-perfusion on OCTA (p = 0.001).

Conclusion

OCTA and FA are complementary tools in RVO assessment. While OCTA is more precise in the assessment of FAZ and capillary non-perfusion, FA offers better vascular imaging of the peripheral retina.

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Authors and Affiliations

  1. Department of Ophthalmology, United Christian Hospital, Kowloon, Hong Kong SAR

    Chung Yee Chung, Heather Hoi Yau Tang, Siu Hung Li & Kenneth Kai Wang Li

  2. Department of Ophthalmology, Tseung Kwan O Hospital, New Territories, Hong Kong SAR

    Chung Yee Chung, Heather Hoi Yau Tang, Siu Hung Li & Kenneth Kai Wang Li

  3. Department of Ophthalmology, LKS Faculty of Medicine, The University of Hong Kong, Hong Kong, Hong Kong SAR

    Chung Yee Chung, Heather Hoi Yau Tang, Siu Hung Li & Kenneth Kai Wang Li

Authors
  1. Chung Yee Chung
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  2. Heather Hoi Yau Tang
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  3. Siu Hung Li
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Correspondence to Chung Yee Chung.

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Chung, C.Y., Tang, H.H.Y., Li, S.H. et al. Differential microvascular assessment of retinal vein occlusion with coherence tomography angiography and fluorescein angiography: a blinded comparative study. Int Ophthalmol 38, 1119–1128 (2018). https://doi.org/10.1007/s10792-017-0570-y

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  • DOI: https://doi.org/10.1007/s10792-017-0570-y

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