Color Doppler imaging of orbital vasculature before and after orbital decompression in thyroid eye disease.

Purpose : To measure alterations in orbital blood flow parameters using color Doppler imaging (CDI) before and after orbital decompression in patients with moderate to severe thyroid eye disease (TED). Methods : Resistance index (RI) and maximum and minimum velocity of ophthalmic artery (OA), superior ophthalmic vein (SOV), and central retinal artery (CRA) of 24 eyes (14 patients) with TED were measured before and at least 3 months after cosmetic orbital decompression procedure (single or double walls) using CDI. Complete eye examination was performed to define the severity (EUGOGO classification) and activity (clinical activity score) of TED. Results : Median OA ( p  = 0.003) and CRA ( p  = 0.001) resistance indices were significantly reduced postoperatively. Significant differences were found in maximum ( p  = 0.001) and minimum ( p  = 0.014) velocity of SOV before and after surgery. While a significant decrease in exophthalmometry was observed after the orbital decompression ( p  = 0.031), intraocular pressure changes were not significant ( p  = 0.182). Conclusion : Orbital decompression procedure led to a significant reduction of RI in both CRA and OA in patients with TED.