Área Técnica: Retina
EVALUATION OF PERIPAPILLARY RETINAL BLOOD VESSEL DIAMETERS IN UNILATERAL ISCHEMIC CENTRAL RETINAL VEIN OCCLUSION USING INFRARED IMAGING.
To compare peripapillary retinal blood vessels diameter in eyes with unilateral ischemic central retinal vein occlusion (CRVO) and to compare the results with those of the contralateral unaffected eye.
Eleven consecutive patients with unilateral ischemic CRVO had the artery and vein diameters at the 12 or 6 o’clock position at 3,000 µm from the disc measured using infrared photographic imaging (Spectralis; Heidelberg Engeneering, Heidelberg, Germany software) both in the affected and in the unaffected eyes and compared. The extension of retinal nonperfusion were evaluated according Central Retinal Vein Study, which divided it by groups from 1 to 4, depending on the number of disc areas (DA) of retina nonperfusion and then they were correlated with retinal vessels diameters.
The mean age was 57.8 years (range, 44-78) and 6 were women. In eyes with CRVO, the median retinal vein diameter was 166 µm, mean ± standard deviation (SD) was 171.6±36.8 (range, 121-260) µm and retinal artery median was 78 and mean±SD was 90.6±31.1 (range, 64-157) µm. Corresponding values in the contralateral unaffected eye was 106 and 104.2±11.2 (range, 91-120) µm and 58 and 67.7±18.5 (range, 50-97) µm. Both retina vein and artery diameters were significantly increased in the eye with CRVO compared to controls (P=0.003 and 0.021, respectively). The median DA of retina nonperfusion was group 3 and mean±SD was 3±1 (range, 1-4). Eyes with more than 75 DA of retina nonperfusion have the diameter of vein, median 177.5 µm and artery, median 80 µm, both increased when compared with eyes with less DA of retinal nonperfusion: vein, median 166 µm and artery, median 78 µm, however the correlation was not statiscally significant.
Ischemic CRVO eyes present enlarged diameter both of the vein and the retinal arteries near the disc. Measuring retinal vessel diameters using infrared photograph and optical coherence tomography is a feasable method and may be useful in future studies.