32 In one physiological study, the area of the upper airway showed a trend to increase in patients treated with nasal expiratory positive airway pressure. 33 This effect could contribute to the clinical efficacy of NIV in acute hypoxaemic respiratory failure.
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Study protocol for the HONIVAH trial: a single-centre randomised study assessing high-flow oxygen therapy versus non-invasive ventilation on lung volumes and the upper airway <b>in hypoxemic critically ill patients</b>.
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