Abstract
Background
The application of three-dimensional (3D) visualization techniques to evaluate the earliest visible onset of abnormal retinal vascular development in preterm infants with retinopathy of prematurity (ROP), using bedside non-contact optical coherence tomography (OCT) imaging to characterize morphology and sequential structural changes of abnormal extraretinal neovascularization.
Methods
Thirty-one preterm infants undergoing routine ROP screening with written informed consent for research imaging were enrolled in this prospective observational study. We imaged the macula and temporal periphery of preterm infants using a handheld OCT system (Envisu 2300 or handheld swept-source research system). The scans obtained were segmented and, using enhanced ray casting, were converted to 3D volumes to which color filter was applied.
Results
Using colorized 3D visualization, we defined extraretinal neovascular structures as buds, bridging networks, and placoid lesions. We could longitudinally follow progression and regression of extraretinal neovascularization in stage 3 ROP after treatment in one infant over 12 weeks and document the appearance of early buds, and formation of florid neovascularization. From stages 2 to 3 ROP, we observed progression from sessile buds to a complex plaque that corresponded to stage 3 ROP on clinical examination. We demonstrated regression of neovascular complexes to small pre-retinal tufts after treatment with anti-VEGF.
Conclusions
The extension of OCT processing to include surface flattening and colorization that further improved structural analysis rendered better understanding of extraretinal tissue. Our ability to image similar areas in the same infant over multiple visits enabled us to study the evolution of these structural components and follow pathological vascular events longitudinally in development and regression after treatment. These methods can be applied to further study which are likely contribute to our understanding of the pathophysiology of neovascularization in ROP.
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Acknowledgements
The authors would like to thank Du Tran-Viet and Alexandria Dandridge (Duke University Eye Center), for data acquisition, Dr. Neeru Sarin, MBBS (Duke University Eye Center), and Dr. C Michael Cotten (Department of Neonatology, Duke University Medical Center) for recruiting infants for the study. We also thank Colin A. Bretz, PhD (Moran Eye Center, Utah) for preparing, staining, and imaging the retinal flat-mount of the rat OIR model.
Funding
Bayer global ophthalmology awards program (GOAP) fellowship project award, K23EY028227 and RPB career development award (XC); The Hartwell Foundation (CAT); The Andrew Family Charitable Foundation (CAT); Grants P30 EY001583, RO1 EY025009 and R01 EY015130 and R01 EY017011 from the National Eye Institute (NEI); Rockefeller Writing Residency (CAT); and an Unrestricted Grant from Research to Prevent Blindness, Inc., New York, NY, to the Department of Ophthalmology & Visual Sciences, University of Utah. Its contents are solely the responsibility of the authors and do not necessarily represent the official view of NEI, or NIH. The sponsors or funding organizations had no role in the design or conduct of this research.
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This study was conducted under two study protocols and was approved by the Duke University Medical Center institutional review board and adhered to the tenets of the Declaration of Helsinki.
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Dr. Toth receives royalties through her university from Alcon. Dr. Izatt has a patent and receives royalties from Leica Microsystems. No other authors have financial disclosures. No authors have a proprietary interest in the current study.
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All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.
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Written informed consent was obtained from all individual participants (parent/guardian) included in the study.
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Mangalesh, S., Bleicher, I.D., Chen, X. et al. Three-dimensional pattern of extraretinal neovascular development in retinopathy of prematurity. Graefes Arch Clin Exp Ophthalmol 257, 677–688 (2019). https://doi.org/10.1007/s00417-019-04274-6
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DOI: https://doi.org/10.1007/s00417-019-04274-6