Depending on the drugs that would be given before the induction of anesthesia with etomidate , the patients were separated into 4 groups : no pretreatment ( Group NP ) , fentanyl 1 ug.kg-1 ( Group F ) , midazolam 0.03 mg.kg-1 ( Group M ) , and midazolam 0.015 mg.kg-1 + fentanyl 0.5 ug.kg-1 ( Group FM ) .
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