The aim of our study is to evaluate the effect of magnesium on the hypnotic effect of propofol. To achieve this, the investigators will analyse the effect of magnesium on the brain concentrations of propofol required to achieve a State Entropy value between 50-60, which corresponds to the recommended depth of anaesthesia. Our study will also evaluate the intraoperative anti- nociceptive effect of magnesium using pupillometry and its two indices, PPI and PRD
The aim of our study is to evaluate the effect of magnesium on the hypnotic effect of propofol.