Association between abo blood group and non-traumatic spontaneous subconjunctival haemorrhage

Abstract

Purpose: To explain the relationship between blood groups and subconjunctival haemorrhage (SCH). Materials and Methods: Four-hundred and fifty-seven subjects were included in this prospective cohort study. The demographic characteristics, systemic diseases and blood groups of the patients with SCH who had spontaneous, non-traumatic and non-infecti ous causes and the patients who applied to the outpatient clinic consecutively were compared using multiple regression analysis. Results: Eighty-two patients (17.9%) had SCH. Of these 82 SCH patients, 56 (68.3%) were female and 40 (48.8%) had blood group 0. Thirty (36.6%) patients had a history of anticoagulant medication, 50 (61%) had hypertension (HT) and 21 (25.6%) had diabete s mellitus. Multivariate analysis demonstrated that the presence of blood group 0, HT and anticoagulant were effective in the formation of SCH (OR 2.453 95% CI 1.467–4.101 p = 0.001, OR 2.653 95% CI 1.491–4.652 p = 0.001, OR 2.454 95% CI 1.309–4.598 p = 0.005, respectively) Conclusion: SCH is observed more in patients with blood group 0.