Study Status: Withdrawn
Recruit Status: Withdrawn
Study Type: Interventional
Official Title: Effect of Dexmedetomidine on Optic Nerve Sheath Diameter During Laparoscopic Anterior Resection
Brief Summary: Dexmedetomidine, might attenuate the sympathetic activation and contribute to stable hemodynamics. The investigator hypothesized that continuous infusion of dexmedetomidine during laparoscopic lower abdominal surgery, might help to attenuate the increment of intracranial pressure and the investigator would observe the optic nerve sheath diameter using ultrasonography.