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Quantification of Macular Microvascular Changes in Patients With Retinitis Pigmentosa Using Optical Coherence Tomography Angiography

Inooka, Daiki 井岡, 大樹 名古屋大学

2020.04.02

概要

PURPOSE. To evaluate the microvascular changes in eyes with RP quantitatively using optical coherence tomography angiography (OCTA) and to determine whether the correlations between these indices and the severity of RP are significant.

METHODS. This was a retrospective, observational study. The medical records of 53 RP patients and 46 controls were reviewed. The OCTA images were obtained with the Cirrus 5000 with Angioplex, and an automated program was used to analyze the microvascular patterns. The perfusion density (PD) and vessel length density (VLD) were used as indices of the microvascular density, whereas the vessel diameter index (VDI) was used as a measure of the caliber of the vessels. The width of the ellipsoid zone (EZ) in the OCT images and the mean deviation (MD) of the Humphry Field Analyzer (HFA) were used to determine the severity of the RP. Student’s t-tests and Spearman’s correlation tests were used.

RESULTS. Both the PD and VLD in the superficial and deep plexuses and the whole retina were significantly reduced, and the VDI was significantly increased in RP patients compared with the corresponding values of the controls (P < 0.001). Spearman’s rank tests indicated the RP severity was significantly correlated with the PD and VLD in all three layers (P < 0.001, r ranging from 0.50 to 0.87) and significantly correlated with VDI in the deep and the whole retina (P < 0.001, ranging from 0.64 to 0.73).

CONCLUSIONS. Quantitative changes in the microvascular density might be useful for examining the pathophysiology of RP.

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