This study analyzes the analgesic efficacy and adverse events of nitrous oxide 70% combined with basic analgetics compared to nitrous oxide 70% with fentanyl intranasal for analgosedation for short and painful procedures in children.

Nitrous oxide 70% (N20 70%) combined with 30% oxygen meets many criteria of an ideal pain medication for procedural analgosedation in children. At the emergency department of the Children's Hospital of Zurich, Switzerland, N20 70% is regularly used for short and painful orthopaedic procedures, mostly for reduction of dislocated forearm or finger fractures. The analgesic efficacy of N20 70% still remains controversial. Therefore, all children who are eligible for N20 70% receive additionally either fentanyl or placebo intranasal and then their behavior, level of sedation and adverse events are measured during the painful procedure. The hypothesis is that a combination of N20 70% and fentanyl intranasal is not significant better than N20 70% combined with basic analgetics.

Inclusion Criteria:

• indication for nitrous oxide 70% application
• boys/girls aged 2-16 years
• informed consent

Exclusion Criteria:

• due to language barrier no sufficient communication possible to explain the study
• incompatibility to Fentanyl Sintetica
• incompatibility to morphinomimetics