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Q. Liang, D. T. Wong; The Artery Order of Arteriovenous Crossing and Branch Retinal Vein Occlusion. Invest. Ophthalmol. Vis. Sci. 2010;51(13):3536.
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© ARVO (1962-2015); The Authors (2016-present)
By reviewing a large group of Branch Retinal Vein Occlusion (BRVO) images, the arteriovenous (AV) crossings formed by the first-order artery were identified at the majority of the occlusion sites. This study was to investigate how the number and proportion of the AV crossings formed by different orders of arteries related to BRVO.
A case-control study was done on the fundus images of 266 BRVO eyes (249 patients) taken in our tertiary retina center in a 5-year period. All BRVO AV crossings (266) were in temporal quadrants and served as study group. The corresponding crossings which had the same order of the vein as the study crossings were selected on the opposite temporal arcade in study eyes as control group 1 (249 crossings) and on the same arcade in fellow eyes as control group 2 (236 crossings). The number and percentage of the AV crossings with different artery orders were compared between the study group and 2 control groups respectively.
There were 89% first-order-artery crossings in the study group, significantly more than 60% in control group 1 (P<0.001) and 54% in control group 2 (P<0.001). There was no statistically significant difference between 2 control groups. There were 11% second-order-artery crossings in the study group and nearly 85% of these crossings were within 1/2 disc diameter (DD) to its originated bifurcation from the first-order artery. There were 16% and 14% second-order-artery crossings of the same type in control groups 1 and 2. There were no statistically significant differences in all second-order-artery comparisons.
This study showed that the majority of BRVO crossings were formed by the first-order artery. It is suggesting that the first-order-artery crossing probably plays a more important role and has higher risk than the AV crossings with lower artery orders in BRVO. Further study will be necessary to confirm this finding.
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