The treatment of acute severe pain in pediatric emergencies required a quick and effective therapeutic support. Actually in France, only peripheral venous access or oral therapies with onset of action are commonly used and only few treatments can be used to manage the acute severe pain in children. In June 2017, an intranasal fentanyl use protocol has been established in the pediatric emergency department of Mercy hospital-Metz. The intranasal fentanyl treatment has proved his effectiveness and safe condition in many countries since few years even though has not yet obtained a marketing authorization for use in children in France. In view of the information, parental permission was obtained before the intranasal administration. The efficacy and surveillance data in all patient records of children who benefited this analgesic protocol were retrospectively collected between June 2017 and August 2018. This retrospective study wants to describe the efficacy and safety of intranasal fentanyl on the pediatric emergency department.

Inclusion Criteria:

• All patients who received fentanyl intranasal between june 2017 and august 2018

Exclusion Criteria:

• Lack of surveillance data in the medical record of the patient

• Pediatric patients of the emergency pediatric department of Mercy hospital
• Coming for acute severe pain : EVA or FLACC scale >=6 for less than 6 hours
• Age more than 12months
• Weight 10kg to 68kg
• Veinous access difficult to obtain
• No contra-indication for fentanyl use
• No contra-indication for intranasal administration