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Normalization of orbital arterial blood flow in non-ischemic central retinal vein occlusion after 6 months
P V Vécsei1, K Kircher, N Maar
1Department of Ophthalmology, University of Vienna Medical School, Austria. Veronika.Vecsei@akh-wien.ac.at
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 afferent arteries.