The aim of this randomized controlled trial is to evaluate an algorithmic approach to gradually adding pressure-supported ventilation and end-tidal positive pressure when conventional tidal volume breathing is insufficient for adequate preoxygenation. The main question it aims to answer is: * Will the proportion of patients receiving preoxygenation increase? * Will the duration of preoxygenation decrease? Participants will; * 200 patients who were planned to undergo general anesthesia for elective surgeries * aged between 18 and 65 years * ASA 1-2 physical status * ETO2 \<90% at the end of the 3rd minute with spontaneous tidal volume breathing
Age range
18 Years – 65 Years
Sex
ALL
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A starting point for the conversation — always confirm anything about your own eligibility, costs, and care with the study team and your doctor.
Adequate preoxygenation.
Timeframe: The moment when the end-tidal oxygen value of patients with insufficient preoxygenation at the end of the third minute with spontaneous tidal volume breathing is 90 and above.