The purpose of this study is to investigate the effect of diphenhydramine on the prevention of sevoflurane induced emergence delirium/ agitation in pediatrics. The Investigators hypothesis is that it reduce the incidence of sevoflurane induced emergence delirium/ agitation.

This is an experimental clinical trial in double-blinded randomized controlled design on 50 children aged 10 months to 21 months who underwent general anesthesia with sevoflurane for labioplasty surgery. Fifteen minutes before inhalation anesthetics were discontinued, the subjects were randomly given a placebo or a single dose of diphenhydramine 0, 5 mg / kg intravenously. Subjects were extubated and observed in the recovered space conscious for any agitation or emergence delirium and feasability to return to the ward. Agitation or emergence delirium was assessed by the Pediatric Emergence Agitation and Delirium Score (PAEDS) whereas feasability to return to the ward scored with the Steward score. When PAEDS> 10 patients were assessed to be agitated or having emergence delirium and administeres rescue tranquilizer ketamine 0.1 mg / kg. Total rescue tranquilizers and clinically significant adverse effects of drugs also recorded.

Inclusion Criteria:

ASA I or 2

• no cardiovascular, respiratory or neurologic congenital anomalies
• no allergic reactions, or any contraindication to drugs used in this trial ever documented

Exclusion Criteria:

• congenital anomalies recognized/diagnosed during trial procedures
• hemmorhage > 15% EBV
• shock or other major anesthesia or surgical complications during trial procedures (hipoxia, atelectasis, unintended disconection of ETT or IV line)