"KETOMED: Ketonemia and Risk of Emergence Delirium in Children Undergoing General Anesthesia - A Multicenter Observational Study"

The objective of this observational study is to evaluate the relationship between ketonemia and emergence delirium in children undergoing general anesthesia. The main questions it aims to answer are: * Does the level of ketonemia correlate with the risk of emergence delirium in pediatric patients? * Are there specific perioperative factors that influence this relationship? If there is a comparison group: Not applicable, as this is an observational study without intervention groups. Participants will be asked to: * Provide clinical and demographic information relevant to anesthesia and perioperative care. * Undergo standard perioperative monitoring, including ketonemia measurement. * Allow researchers to record anesthesia and recovery outcomes related to emergence delirium.