A Trial of Dexmedetomidine Hydrochloride Nasal Spray in Preoperative Sedation of Children

"In the low weight group, the subjects will receive a low dose of dexmedetomidine nasal spray.~In the high weight group, the subjects will receive a high dose of dexmedetomidine nasal spray."

"In the low weight group, the subjects will receive dexmedetomidine hydrochloride nasal spray blank preparation.~In the high weight group, the subjects will receive dexmedetomidine hydrochloride nasal spray blank preparation."