PMID: 8459996Mar 1, 1993Paper

Optic nerve sheath decompression may improve blood flow in anterior ischemic optic neuropathy

Ophthalmology
P M FlahartyP J Savino

Abstract

The purposes of this study are to evaluate the retrobulbar circulation in progressive nonarteritic ischemic optic neuropathy (NAION) and to assess changes in blood flow after optic nerve sheath decompression (ONSD). Twenty-five patients with progressive NAION were studied using color Doppler imaging (CDI) before and after ONSD. Blood flow velocities and vascular resistance were calculated for the ophthalmic artery, central retinal artery, and posterior ciliary arteries in each eye. Contralateral eyes served as the control group. Preoperatively, the study group demonstrated significantly lower blood flow velocities in the central retinal artery (P < 0.002) and posterior ciliary arteries (P < 0.02) when compared with the contralateral control group. Postoperatively, there was a significant increase in blood flow velocity in the ophthalmic artery (P < 0.04) and the central retinal artery (P < 0.05) as well as a significant decrease in vascular resistance in the posterior ciliary arteries (P < 0.02) in the study group. There were no significant changes in blood flow velocity or vascular resistance in the contralateral control group. Long-term follow-up on eight patients suggests a persistence of this trend. Seventeen of the 25 oper...Continue Reading

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