European Resuscitation Council 2021 Guidelines and Advanced Life Support Provider Courses teach that the oxygen supply must be removed from the patient during defibrillation to the distance of minimum of 1 meter. Scientific articles describe few incidents of fire during defibrillation in oxygen - enriched atmospheres. The study aims to performed a series of measurement of the oxygen concentration in the environment around the patient with different airway management used and ventilation provided.
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Oxygen levels
Timeframe: From the initiation of oxygen therapy at the start of anesthesia induction until the completion of oxygen therapy at the end of the procedure (ranging from 30 minutes to 6 hours), oxygen concentration will be assessed continuously.