 The incidence of arterial hypotension under general anesthesia using sevoflurane is particularly high in newborns and infants up to 6 months of age. A decrease of 20 of the initial mean blood pressure mBP is the definition of significant arterial hypotension in adults and children. In adults, intraoperative arterial hypotension is associated with an increase of intraoperative mortality and a certain neurological morbidity. In infants under 6 months of age, neurological disorders have been reported following general anesthesia. Neurotoxicity of hypnotics is often incriminated as should be the episodes of arterial hypotension. 