Lidocaine has been shown to increase the hypnotic effects of Propofol, however no trials shows the effects on Bispectral Index Values (BIS) and spectral analysis during total intravenous anesthesia maintenance delivered with target controlled infusion (TCI) with stable Concnetration at the effector site of Propofol (CeP)
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Correlation between BIS values and power spectrum before and after lidocaine administration
Timeframe: We collect data about propofol concentration (ng/ml)and BIS values during general anaesthesia. We will collect BIS and TCI Propofol values during all the duration of anesthesia, form the start o anesthesia until the emergence from anesthesia