Children ( n = @ , American Society of Anesthesiologists -LSB- ASA -RSB- classes I-II , aged @-@ y ) scheduled for tonsillectomy were randomly and equally assigned to @ groups : DEX-IV , for intravenous injection of dexamethasone ( @ mg/kg , maximum dose @ mg ) ; DEX-INF , given the same amount of dexamethasone by local infiltration to the upper middle and lower poles of the tonsils ; and a control group not given dexamethasone .