Comparison of Two FiO2 (1 or 0.5) for Tracheal Extubation in Post-anesthesia Care Unit

The purpose of the study is to assess the optimal fraction of inspired oxygen (0.5 or 1) for extubation or removal of a supraglottic airway device after general anesthesia.

During pre-anesthesia visit, eligible patients receive oral and written information of the study and potential risks. In the operating room all patients giving a written informed consent will undergo at the end of surgery a screening to determine eligibility for study entry. Before emergence from general anesthesia, patients who meet the eligibility requirements will be randomized in a open label manner to receive a 0.5 or 1 FiO2.