METHODS	Both groups received pre-operatively midazolam , followed intra-operatively by propofol , sevoflurane , atracurium , and either remifentanil infusion 0.2 microg/kg/min ( G1 ) , or the same dose of remifentanil infusion and low doses of ketamine infusion 1 microg/kg/min ( G2 ) anesthetics , antidote medication and post-operative morphine doses .\