PURPOSE: To determine whether disorganization of retinal inner layers (DRIL) on optical coherence tomography (OCT) is associated with ischemia on ultra-widefield fluorescein angiography (UWFFA) and with visual outcomes in eyes with acute, treatment-naïve central retinal vein occlusion (CRVO). DESIGN: Retrospective, single-institution, longitudinal cohort study. PARTICIPANTS: Twenty-five consecutive patients with treatment-naïve CRVO and ≥ 1 year follow-up. METHODS: Two independent masked graders evaluated the extent of DRIL, ellipsoid zone disruption, external limiting membrane disruption, and other OCT parameters at the baseline, 6- month, 12-month, and final visits. Baseline UWFFA images were assessed for ischemic index values and foveal avascular zone (FAZ) enlargement. MAIN OUTCOME MEASURES: Associations of DRIL with UWFFA findings and clinical outcomes including corrected visual acuity (VA). RESULTS: The median time to final follow-up was 24 months (range 12.1 - 43.9 months). Median DRIL extent at baseline was 765 µm (range 0 - 1000 µm). Eighteen of 25 eyes (72%) had some degree of DRIL at baseline, and 20 of 25 eyes (80%) had cystoid macular edema (CME). Neither the presence nor extent of DRIL at baseline was associated with presenting VA. In a cross-sectional analysis of each visit, extent of DRIL correlated with worse VA at both the 6-month (ρ = 0.656; p = 0.001) and final (ρ = 0.509; p = 0.016) visits. At final follow-up, DRIL extent was the OCT parameter most strongly correlated with baseline ischemic index (ρ = 0.418; p = 0.047) and baseline enlarged FAZ (p = 0.057) on UWFFA. On multivariate regression analysis, DRIL extent at final follow-up was the only OCT parameter associated with worse VA (p = 0.013) and remained significant when accounting for CME as a potential confounder. CONCLUSIONS: Extent of DRIL was not associated with presenting VA in treatment-naïve eyes with acute CRVO. Following six months of follow-up however, DRIL extent correlated with worse VA and was predictive of worse VA throughout more than 2 years of follow-up. Ischemic features on UWFFA at baseline are predictive of the extent of DRIL development at final follow-up.
PURPOSE: To determine whether disorganization of retinal inner layers (DRIL) on optical coherence tomography (OCT) is associated with ischemia on ultra-widefield fluorescein angiography (UWFFA) and with visual outcomes in eyes with acute, treatment-naïve central retinal vein occlusion (CRVO). DESIGN: Retrospective, single-institution, longitudinal cohort study. PARTICIPANTS: Twenty-five consecutive patients with treatment-naïve CRVO and ≥ 1 year follow-up. METHODS: Two independent masked graders evaluated the extent of DRIL, ellipsoid zone disruption, external limiting membrane disruption, and other OCT parameters at the baseline, 6- month, 12-month, and final visits. Baseline UWFFA images were assessed for ischemic index values and foveal avascular zone (FAZ) enlargement. MAIN OUTCOME MEASURES: Associations of DRIL with UWFFA findings and clinical outcomes including corrected visual acuity (VA). RESULTS: The median time to final follow-up was 24 months (range 12.1 - 43.9 months). Median DRIL extent at baseline was 765 µm (range 0 - 1000 µm). Eighteen of 25 eyes (72%) had some degree of DRIL at baseline, and 20 of 25 eyes (80%) had cystoid macular edema (CME). Neither the presence nor extent of DRIL at baseline was associated with presenting VA. In a cross-sectional analysis of each visit, extent of DRIL correlated with worse VA at both the 6-month (ρ = 0.656; p = 0.001) and final (ρ = 0.509; p = 0.016) visits. At final follow-up, DRIL extent was the OCT parameter most strongly correlated with baseline ischemic index (ρ = 0.418; p = 0.047) and baseline enlarged FAZ (p = 0.057) on UWFFA. On multivariate regression analysis, DRIL extent at final follow-up was the only OCT parameter associated with worse VA (p = 0.013) and remained significant when accounting for CME as a potential confounder. CONCLUSIONS: Extent of DRIL was not associated with presenting VA in treatment-naïve eyes with acute CRVO. Following six months of follow-up however, DRIL extent correlated with worse VA and was predictive of worse VA throughout more than 2 years of follow-up. Ischemic features on UWFFA at baseline are predictive of the extent of DRIL development at final follow-up.
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