Risk factors, antithrombotic treatment and outcome in retinal vein occlusion: an age-related prospective cohort study

Objectives: Antithrombotic treatment for retinal vein occlusion (RVO) is controversial, although RVO has been surmised as a predictor of a subsequent vascular event. We aimed to evaluate risk factors, the effects of antithrombotic therapy and the occurrence of subsequent vascular events in patients with a first episode of RVO, according to age of RVO onset. Methods: In this prospective cohort study, patients with central (CRVO) and branch RVO (BRVO) confirmed by fluorescein angiography were studied; they were divided according to age. Cardiovascular risk factors and thrombophilia were evaluated. Anticoagulants or aspirin were given for at least 3 months . Patients were followed every 6 – 12 months and vascular events were recorded. Results: One hundred CRVO and 32 BRVO patients were enrolled. Five of 60 (8.3%) patients < 50 yr and 4/72 (5.5%) over 50 yr had a hereditary thrombophilic defect. One or more cardiovascular risk factors were found in 35 (58%) patients of the younger group, and in 66 (91%) of the older group ( P < 0.001). Antithrombotic treatment led to both a satisfactory recanalization of occluded veins and visual acuity improvement especially in younger patients. Vascular events occurred in 19 (14%) cases after 4 3.3 yr from RVO, more frequently in older than in younger patients (22% vs. 5%, P = 0.005). Conclusions: Distribution of cardiovascular, but not of thrombophilic risk factors seems to be influenced by age in RVO patients. Patients with a first RVO, especially those > 50 yr, are likely at risk of a subsequent vascular event.