Comments on "Post-extubation high-flow nasal cannula oxygen therapy versus non-invasive ventilation in chronic obstructive pulmonary disease with hypercapnic respiratory failure".

Dear Editor, The recent study published by Ketan et al. provides emerging evidence on the expanding indications for high-flow nasal oxygen therapy in chronic obstructive pulmonary disease. The indications for hypoxemic respiratory failure are robust, and the indications for HFNO in hypercapnic respiratory failure are emerging...