Comparison of Two Electroencephalograms (EEG) Monitors in Patients Undergoing General Anesthesia With Sevoflurane

Inclusion criteria

• Patients affiliated to a national insurance scheme or benefiting from such a program
• Patients having given their written consent.
• Patients that must benefit from a general anesthesia with the aim of a surgical act of a duration of at least one hour
• Patients that must benefit from a general anesthesia including a maintenance by the sevoflurane.
• For the patients taken care in ambulatory surgery, having a telephone and agreeing to communicate their phone number

Exclusion criteria

• Pregnant or breast-feeding Women
• Patients having a limit of use of the Bispectral Index (BIS) or qCON monitor ,
• Patients having a contraindication in the propofol.
• Patients taken care in ambulatory surgery who could not be contacted within 24 hours following the surgical operation;