Hypotensive Anesthesia for Orthognathic Surgery

1 mcg/kg will be administered intravenously over 10 minutes; followed by maintenance infusion of 0.2 to 1 mcg/kg/hour.

1 mg will be administered intravenously and increase by 0.5-1 mg if the initial dose is ineffective, to a maximum of 15 mg / hour or

20 - 80 mg will be administered intravenously at 10-minute intervals to maximum of 300 mg;