Comparison of high-flow nasal cannula oxygen therapy versus nasal cannula in sedated transoesophageal echocardiography in patients with mitral regurgitation: a prospective, randomized controlled clinical trial.

The absolute risk difference for mechanical ventilation was 0.8% (95% CI: − 0.7% to 2.2%), and the risk difference for severe hypoxia was 1.5% (95% CI: − 0.6% to 3.6%), though these differences did not reach statistical significance due to low event rates (Table 3 ).

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