Eighty ASAI-III elderly patients ( over @ years ) were randomized equally into @ groups including a control group without dexmedetomidine and @ dexmedetomidine groups ( groups D@ , D@ , and D@ ) with loading dexmedetomidine doses of @ , @ , and @ g/kg and maintenance doses of @ , @ , and @ gkg ( -@ ) h ( -@ ) , respectively .