End of the surgery Ondansetron 4mg Discontinuation of propofol TCI Remifentanil TCI 2 ng/ml Extubation based on TOFF ratio > 0.9 Post-operative analgesia (PACU) Remifentanil abrupt discontinuation / NaCl 0.9% (control group with a reduction of 30% /15 mins) (2 -> 1.4 -> 1 -> 0.7-> 0.5 -> 0.35 -> 0.25 -> 0 ng/ml) Acetaminophen 1g/6h Diclofenac 1mg/kg /12h Morphine (two mg / 5 min if NRS > 3/10) (As all patients are monitored and under immediate medical surveillance, no limit will be imposed to morphine consumption.)