A Prospective, Multi-center, Randomized Controlled Study of Muscle Relaxation Effect and Safety of Mivacurium Chloride in Pediatric Surgery Patients

intravenously injected during induction with the dose according to allocated group, and intravenously injected with the dose of 0.1 mg/kg when T1 recovers to 25% during period of maintenance.

"Before induction: after moving into operating room, oral administration with dose of 0.5 mg/kg or mixed with ketamine (midazolam 10 mg+ ketamine 100 mg) with dose of 0.1 ml/kg by intramuscular route for uncooperative children~Induction: for children who didn't receive mixture of midazolam and ketamine before induction, it will be given with the dose of 0.05 ml/kg"

"mixed with ketamine (midazolam 10 mg+ ketamine 100 mg) with dose of 0.1 ml/kg by intramuscular route for uncooperative children~Induction: for children who didn't receive mixture of midazolam and ketamine before induction, it will be given with the dose of 0.05 ml/kg"

Induction: 2 to 3 mg/kg Maintenance: 50 to 100 mcg/kg/min

Induction: 2 mcg/kg Maintenance: 0.1 to 0.3 mcg/kg/min