The effect of pretreatment with nondepolarizing muscle relaxants ( atracurium 40 micrograms/kg or metocurine 50 micrograms/kg ) , benzodiazepine agonists ( diazepam 5 mg or midazolam 2.5 mg ) , or thiopental sodium 1 mg/kg on the increased muscle tone produced by alfentanil 175 micrograms/kg was compared with a control group ( given no pretreatment ) .
