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Here, we investigated early changes in the choroidal and retinal blood flow using OCTA imaging in a cohort of patients undergoing anti-VEGF intravitreal injections (IVI) for macular edema following retinal vein occlusion and diabetic retinopathy. In this prospective single-center, observational study, the pre- and post-IVI changes in retinal perfusion were examined via assessment of vessel length density (VLD) and vessel density (VD) in deep and superficial capillary segmentations (DCP and SCP), foveal avascular zone (FAZ) in SCP, as well as flow signal deficits in the choriocapillaris segmentation. Mean IOP significantly changed over the study course (<jats:italic>p<\/jats:italic>\u2009=\u20090.000; ANOVA). Measurements at 5\u00a0min post-IVI (33.48\u2009\u00b1\u200910.84\u00a0mmHg) differed significantly from baseline (17.26\u2009\u00b1\u20092.41\u00a0mmHg, <jats:italic>p<\/jats:italic>\u2009=\u20090.000), while measurements from one day, one week, and one-month post-IVI did not (<jats:italic>p<\/jats:italic>\u2009=\u20090.907, <jats:italic>p<\/jats:italic>\u2009=\u20091.000 and <jats:italic>p<\/jats:italic>\u2009=\u20091.000 respectively). In comparison to baseline, no changes in OCTA parameters, including FAZ, VD, VLD, and FV, were detected 5\u00a0min post-IVI. No significant alterations in OCTA parameters were observed during study course. Increased IOP spikes were detected post-IVI; however, no potential permanent ischemic retinal damage was suspected.<\/jats:p>","DOI":"10.1038\/s41598-021-98850-8","type":"journal-article","created":{"date-parts":[[2021,9,29]],"date-time":"2021-09-29T10:25:07Z","timestamp":1632911107000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":14,"title":["Acute and subacute macular and peripapillary angiographic changes in choroidal and retinal blood flow post-intravitreal injections"],"prefix":"10.1038","volume":"11","author":[{"given":"Nadhini","family":"Arumuganathan","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Maximilian Robert Justus","family":"Wiest","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Mario Damiano","family":"Toro","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Timothy","family":"Hamann","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Katrin","family":"Fasler","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Sandrine Anne","family":"Zweifel","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2021,9,29]]},"reference":[{"key":"98850_CR1","doi-asserted-by":"publisher","first-page":"490","DOI":"10.1097\/IAE.0b013e3182a0e446","volume":"34","author":"M Reibaldi","year":"2014","unstructured":"Reibaldi, M. et al. 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