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Automated evaluation of parapapillary choroidal microvasculature in thyroid eye disease

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Abstract

Purpose

The purpose of the study was to investigate the parapapillary choroidal microvasculature in thyroid eye disease (TED) using optical coherence tomography angiography (OCTA).

Methods

Only one eye of each subject was included in the study. Patients with TED and controls were included in the study. Participants were divided into three groups: control, inactive TED (ITED) and active TED (ATED). OCTA scans of the optic discs were obtained in a 4.5 × 4.5-mm rectangular area. Radial peripapillary capillary (RPC) density and peripapillary retinal nerve fibre layer (pRNFL) thickness were automatically calculated by the device software. Parapapillary choroidal microvasculature (PPCMv) density was automatically calculated using MATLAB software.

Results

Forty-one patients with TED and 40 controls were included in the study. RPC density was significantly decreased in the ATED and dysthyroid optic neuropathy (DON) group compared to the controls and ITED group. There was significant increase in pRNFL in the ATED group. PPCMv density increased in the ATED group compared to the controls in whole ring area. The RPC density was significantly correlated with the TSHr Ab level (r < − 0.396, p < 0.001). Clinical activity score correlated positively with PPCMv density (r = 0.349, p = 0.001) but negatively with RPC density (r = − 0.321, p = 0.004).

Conclusion

Changes in peripapillary microvascular perfusion may play a role in the development of DON. As the severity of TED increases with clinical activity, so do the changes observed in peripapillary parameters. The decrease in RPC density may be due to compression caused by optic disc oedema, which may result in reduced blood flow. The increase in PPCMv density may be related to factors such as orbital congestion.

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Data availability

The data sets generated and/or analysed in the current study are available from the corresponding author upon reasonable request.

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Funding

The authors declare that no funding, grants or other support were received during the preparation of this manuscript. The authors have no relevant financial interests to disclose.

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Authors and Affiliations

Authors

Contributions

HS contributed to methodology, data curation, formal analysis, statistical and image processing software and writing—original draft. FO helped in conceptualisation, data curation, investigation, validation and writing—revision and editing. MU helped in methodology, project management, visualisation and writing—revision and editing. DGS helped in validation, visualisation and writing—revision and editing.

Corresponding author

Correspondence to Metin Unlu.

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The authors report no potential conflicts of interest.

Ethics approval and informed consent

The study protocol was approved by the local ethics committee of Erciyes University (No.: 2021/356). Written informed consent was obtained from all individual participants.

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Sener, H., Ozer, F., Unlu, M. et al. Automated evaluation of parapapillary choroidal microvasculature in thyroid eye disease. Int Ophthalmol 43, 4323–4331 (2023). https://doi.org/10.1007/s10792-023-02844-6

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  • DOI: https://doi.org/10.1007/s10792-023-02844-6

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