Anesthesic Propofol and Remifentanil Requirements in Obese Patients

Inclusion Criteria: \- Patients scheduled for a bariatric coelioscopic surgical procedure (obese patients) or for an upper abdominal laparoscopic procedure (lean patients) Exclusion Criteria: * age lower than 18 years, * pregnant woman, * presence of a central neurological disorder or a lesion cerebral, of a severe respiratory or hepatic insufficiency, * allergy to propofol, or to soja or to peanuts, or to sufentanil, or to remifentanil, or to morphine, or to a muscle myorelaxant, or to an excipient, * hypersensibility to sufentanil, or to remifentanil or to another derivate of fentanyl, * allergy to latex, * presence of a symptomatic gastroesophageal reflux, * patients receiving a psychotropic treatment or a agonist-antagonist opiate, * presence of predictive signs of difficult mask ventilation of difficult intubation (else than obesity)