Gulmez M, et al. - Researchers conducted the prospective, cross-sectional, comparative, case–control study for assessing short-term blood pressure variability over 24 hours in patients with branch retinal vein occlusion (BRVO) vs controls. Participants in the study were 80 patients with BRVO (ie, Group 1) and 75 controls (ie, Group 2). In a 24-hour period, the blood pressure of each participant was measured by ambulatory monitoring every 15 minutes during the day and every 30 minutes at night. Statistical analyses were performed on the mean systolic blood pressure (SBP), diastolic blood pressure (DBP), arterial blood pressure (ABP) and the variability index reported throughout the day, at night and during the 24-hour cycle. Since the variability of daytime, nighttime, and 24-hour blood pressure in SBP, DBP, and ABP was substantially greater among BRVO patients than among controls, the variability of blood pressure may be a factor in the pathogenesis of BRVO.