Inclusion Criteria:  patient received propofol to undergo monitored general anaesthesia in the CathLabs of the Universitair Ziekenhuis Brussel between the period of 1st of April 2021 - 28th of October 2021 course of the anaesthetic procedure was correctly filled in by the anaesthesiologist in the Metavision software  Exclusion Criteria:  Minors, patients with Brugada syndrome patients who did not receive propofol during the procedure patients who presented with fever Temperature > 38°C procedures in which the anaesthesiologist did not fill in the data of the anaesthetic procedure correctly in Metavision (Type of drug used and timestamps) procedures in which the ECG data was missing or was incorrectly retrieved.