Evaluation of ocular arterial changes in XXXX with color Doppler ultrasonography.

@entity1 @entity2790 @entity726
The purpose of this study was to evaluate hemodynamic changes of the retrobulbar vasculature caused by different intraocular pressures with color Doppler ultrasonography. Fifty normal eyes in 25 @entity1 , 13 @entity1 with normal tension @entity726 , and 19 @entity1 with @entity726 and @entity2790 (greater than 30 mm Hg) were enrolled in this study. In 15 of 19 @entity1 with @entity726 @entity1 , follow-up color Doppler ultrasonography was also undertaken after laser peripheral iridectomy when the intraocular pressure had returned to normal. The peak systolic velocity, end diastolic velocity, resistive index, time average maximum velocity, and pulsatility index were compared in different vessels, including the central retinal artery, lateral posterior ciliary artery, medial posterior ciliary artery, and ophthalmic artery in each orbit. The peak systolic velocity, end diastolic velocity, and time average maximum velocity of the central retinal artery were significantly lower (P<0.01) in @entity726 @entity1 than in the control group. The resistive index and pulsatility index of the central retinal artery were significantly higher (P<0.01) in @entity726 @entity1 than in the control group. The end diastolic velocity of the lateral and medial posterior ciliary arteries was significantly lower in @entity1 with @entity726 than in the control group, and the resistive index and pulsatility index of both of these arteries were significantly higher (P<0.001) in @entity1 with @entity726 than in the control group. However, no statistical significantly differences were found in the peak systolic velocity or time average maximum velocity in either of the posterior ciliary arteries; similarly, no statistically significant differences were noted in any of the parameters in the ophthalmic artery between the control group and the group with @entity726 . The pulsatility index of the central retinal artery and of the lateral and medial posterior ciliary arteries was significantly lower (P<0.01) in @entity726 @entity1 after laser therapy than in @entity726 @entity1 before laser therapy. The resistive index of both posterior ciliary arteries was also significantly lower (P<0.004) in @entity726 @entity1 after laser therapy than before laser therapy. All parameters for all vessels examined among the normal subjects, the @entity1 with normal tension @entity726 , and the @entity1 with @entity726 after laser therapy when the intraocular pressure had returned to normal showed no statistically significant differences. Color Doppler ultrasonography is a good modality for both imaging and studying the hemodynamics of the perioptic nerve vessels.
