Quantium Medical Company has an ElectroEncephalograph-based (EEG-based) algorithm with two outputs: qCON for unconsciousness and qNOX for anti-nociception. qCON, is designed to provide information about the depth of the hypnotic state, similar to that provided by the BIS™.

Inclusion Criteria:

• Patients above 18 years,
• 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 by intravenous drugs (propofol and remifentanil),
• 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 monitors,
• Patients having a contraindication to Propofol and/or to Remifentanil.