qNOX and ANI are two indexes evaluting the analgesia conduction during general anesthesia. No trials have compared them, so with this trial authors want to explore the correlations between them.
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Correlation between qNOX and ANI values
Timeframe: qNOX, ANI, pupoillometry values, propofol and remifentanil concentration during induction, intubation, after post-tetanic count at the trend-of-four and maintenance phase of general anesthesia detected with target controlled inusion will be paired.