It is reported that optic nerve sheath diameter increases when higher volume of medication is injected during epidural anesthesia. This study is designed to compare the optic nerve sheath diameter using 10cc of nomal saline of different speed (3cc/sec vs. 1cc/sec).
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optic nerve sheath diameter change among 4 time period
Timeframe: Baseline, 1 minutes, 10 minutes, 30 minutes after the completion of the intervention