Samer Andrei Nica

Background/Objectives: Retinal artery occlusion (RAO) represents an ischemic event of the anterior circulation, driven by impaired blood flow through the ophthalmic branches of the internal carotid artery. Atrial fibrillation (AF) is an increasingly recognized cardioembolic source in patients with RAO, yet its prevalence remains poorly characterized. We conducted a systematic review and meta-analysis to estimate the pooled prevalence of AF in RAO patients and to summarize evidence on its incidence and association with this condition. Methods: Four databases were searched through April 2025, updated on 18 August 2026. Studies reporting AF prevalence, incidence, or association in adults with RAO were included. Pooled prevalence was estimated using the Freeman–Tukey double arcsine transformation with a random-effects model. Subgroup analyses, meta-regression, and sensitivity analyses were performed to explore heterogeneity. Results: Sixty-two studies were included in the qualitative synthesis, of which 58 reported AF prevalence data. Among the 36 studies comprising 139,222 patients, the pooled AF prevalence was 11.53% (95% CI: 9.41–13.82; I² = 99.2%; prediction interval: 2.00–26.9%). AF prevalence was significantly higher in patients aged ≥70 years (15.86%) and in central RAO cohorts (16.54%). Incident AF following RAO ranged from 10.5% to 41%, increasing progressively with monitoring intensity. The pooled odds ratio for the AF–RAO association was 1.56 (95% CI: 1.06–2.29). Conclusions: AF affects approximately one in nine patients with RAO, though with substantial uncertainty across populations (prediction interval 2.00–26.9%); the extent to which this exceeds the general-population estimates independent of age, cardiovascular risk profile, and geographic factors remains uncertain. These findings support cardiac rhythm surveillance following RAO diagnosis in selected patients, although its effect on clinical outcomes remains to be established prospectively.

Central retinal artery occlusion (CRAO) is an acute ophthalmic emergency causing irreversible vision loss due to retinal ischemia. Inflammation is increasingly recognized as a contributor to vascular occlusions, but the relationship between systemic inflammatory biomarkers and structural retinal damage in CRAO remains unclear. This retrospective study included 37 patients with non-arteritic CRAO presenting within 168 h of symptom onset. Optical coherence tomography (OCT) classified ischemic severity as mild, moderate, or severe based on inner retinal morphology. Systemic inflammatory indices, including neutrophil-to-lymphocyte ratio (NLR), systemic immune-inflammation index (SII), platelet-to-lymphocyte ratio (PLR), monocyte-to-lymphocyte ratio (MLR), and systemic inflammation response index (SIRI), were calculated from admission blood tests, and associations were analyzed using ordinal logistic regression. Increasing severity correlated with higher NLR and SII values (p < 0.05). Univariable analysis showed significant associations for NLR, SII, neutrophil count, white blood cell count, and central macular thickness (CMT). Multivariable regression identified NLR (OR = 8.398, p = 0.007) and CMT (OR = 1.052, p = 0.001) as independent predictors of greater ischemic damage. Other indices were not significant. These findings indicate that NLR is the primary systemic inflammatory predictor of OCT-defined severity in acute CRAO, with CMT providing complementary structural information.

Central retinal artery occlusion (CRAO) is an acute ophthalmic emergency causing irreversible vision loss due to retinal ischemia. Inflammation is increasingly recognized as a contributor to vascular occlusions, but the relationship between systemic inflammatory biomarkers and structural retinal damage in CRAO remains unclear. This retrospective study included 37 patients with non-arteritic CRAO presenting within 168 hours of symptom onset. Optical coherence tomography (OCT) classified ischemic severity as mild, moderate, or severe based on inner retinal morphology. Systemic inflammatory indices, including neutrophil-to-lymphocyte ratio (NLR), systemic immune-inflammation index (SII), platelet-to-lymphocyte ratio (PLR), monocyte-to-lymphocyte ratio (MLR), and systemic inflammation response index (SIRI), were calculated from admission blood tests, and associations were analyzed using ordinal logistic regression. Increasing severity correlated with higher NLR and SII levels (p < 0.05). Univariable analysis showed significant associations for NLR, SII, neutrophil count, white blood cell count, and central macular thickness (CMT). Multivariable regression identified NLR (OR = 8.398, p = 0.007) and CMT (OR = 1.052, p = 0.001) as independent predictors of greater ischemic damage. Other indices were not significant. These findings indicate that NLR is the primary systemic inflammatory predictor of OCT-defined severity in acute CRAO, with CMT providing complementary structural information.