Randomization
Randomization was carried out through a random number generator, by means of repetitions divided into two treatments, using R-2.15.1 Statistics . Treatment assignments were performed at random according to a blocked randomization by the researchers allowed to use the program with a username and password, Group Esmolol (ESM) 0,5mg / kg, Group Dexmedetomidine (DEX) group 0,5-0,8µcg / kg / h.