Normalization Of Orbital Arterial Blood Flow In Non-Ischemic Central Retinal Vein Occlusion After 6 Months

Introduction: Central retinal vein occlusion (CRVO) is a common vascular disorder and may lead to blindness. The aim of the study was to obtain information about the possible imbalance and recovery of orbital arterial blood flow in non-ischemic CRVO.Methods: Vascular resistance (pulsatility index - PI) in the orbital arteries of 14 patients with non-ischemic CRVO was examined within 3 weeks after onset of CRVO and 6 months later. The control group consisted of 14 age-and sex-matched healthy control eyes.Results: PI was increased in all orbital arteries of CRVO eyes measured within 3 weeks after the onset. Normal PI values were recorded in the same retrobulbar arteries, and re-measured 6 months later.Discussion: There is an Increase in vascular resistance in all orbital arteries at the onset of non-ischemic CRVO, followed by a recovery of vascular resistance to normal levels 6 months later. The increase at the onset may be caused by arterial vasospasm or by intraocular hemostasis affecting the efferent arteries.