Prospective Randomized Monocentric Clinical Trial during propofol anesthesia. The aim of the study is to test whether the use of a medical device designed to automatically administer remifentanil during surgery based on expert rules and continuous reading of heart rate, blood pressure and the Analgesia Nociception Index results in lower overall remifentanil administration versus standard practice.
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normalized remifentanil administration
Timeframe: During the surgery, an average Three hours and a half