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Optiflow® to Prevent Post-Extubation Hypoxemia afteR Abdominal Surgery (the OPERA Trial)
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.
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