After IV administration of atropine ( @ mg/kg ) , anesthesia was induced with an infusion of dexmedetomidine ( @ g/kg ) over @ minutes for group D , whereas normal saline was infused for group P. Propofol ( @ mg/kg ) was then injected IV over @ to @ seconds , followed by an infusion of remifentanil ( @ g/kg ) over @ minute for both groups .