To evaluate whether early application of nasal high flow oxygen therapy after extubation can reduce the incidence of postoperative hypoxemia (defined as a PaO2/FiO2 ratio \<300) after abdominal surgery in patients with intermediate to high risk of postoperative pulmonary complications.
Age range
19 Years
Sex
ALL
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percentage of patients who developed postoperative hypoxemia (defined as PaO2/FiO2 ratio <300)
Timeframe: 1 hour after tracheal extubation (day 1)