Evaluation of the Pupil Dilation Reflex in Response to Noxious Stimulation in Anaesthetized Children. A Proof of Concept Trial

"PDR measurement at two standardized times perioperatively:~1. Anesthetized subject by sevoflurane sedation until a minimum alveolar concentration (MAC) of at least 1,5 is reached~2. Administration of fentanyl 2µg/kg, in the absence of adjustments in sedation depth"