Evaluation of hemodynamic changes in the ophthalmic artery with color Doppler ultrasonography after strabismus surgery

Purpose: To investigate the blood flow changes in ophthalmic artery with co lor Doppler ultrasonography after strabismus surgery. Methods: Twenty eyes of 19 patients who underwent recession or resection su rgery on two horizontal rectus muscles in 1 eye were examined using color D oppler ultrasonography preoperatively and 1 week and 1 month postoperativel y. Measurements from both eyes of 16 age- and sex-matched normal subjects s erved as control data. The systolic maximum velocity, mean velocity, end-di astolic velocity, pulsatility index, and resistance index of the ophthalmic artery were determined. The Mann-Whitney U test was performed for comparis on of the control and study group preoperatively for any hemodynamic parame ter. Statistical comparison of the preoperative and postoperative measures in the study group was performed with Friedman's two-way analysis of varian ce. Results: No difference (P>.05) was observed preoperatively between the stud y and control groups for any hemodynamic parameter in the ophthalmic artery . Although the ophthalmic artery showed a slight increase in systolic maxim um velocity 1 month postoperatively, there were no statistically significan t differences (P>.05) in velocities or resistance in the ophthalmic artery at any interval. Conclusion: Two horizontal rectus muscle operations in a previously unopera ted eye do not cause significant hemodynamic changes in the ophthalmic arte ry. However, further studies are needed to obtain more information about th e effect of multiple vertical rectus muscle operations on the blood flow pa rameters of the ophthalmic artery.