High flow nasal oxygen (HFNO) in the immediate postoperative period has been demonstrated to reduce the risk of postoperative pulmonary complications (PPC) after cardiothoracic surgery. In specific groups of patients such as the obese and after upper abdominal surgery the results are contradictive. However, there is lack of evidence if HFNO in the general high-risk patient after abdominal and non-cardiac thoracic surgery can reduce the prevalence of PPC, hypoxaemia and escalation of therapy. Therefore, the investigators aim to compare the use of HFNO with conventional oxygen therapy (COT) in high-risk patients after abdominal and non-cardiac thoracic surgery regarding postoperative pulmonary complications.
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Frequency of postoperative pulmonary complications (PPC) the first seven days after high-risk abdominal or non-cardiac thoracic surgery in high-risk patients with high-flow nasal oxygen or conventional oxygen therapy in the immediate postoperative period
Timeframe: Up to 7 days after surgery