Intracranial pressure is measured indirectly using optic nerve sheath diameter with ultrasound. It is reported that epidural pressure varies according to different posture ( lateral decubitus vs. sitting position). This study is designed to measure the optic nerve sheath diameter in lateral decubitus and sitting position, respectively.
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optic nerve sheath diameter change among 4 time period
Timeframe: Baseline, 10 minutes, 20 minutes, 40 minutes after the completion of the intervention