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Effects of different non-invasive respiratory supports on breathing pattern, ventilation, and comfort; (twenty-one patient). (HFNC= high flow nasal cannula; CPAP= continuous positive airway pressure; NIV= non-invasive mechanical ventilation; RR =Respiratory Rate; Ve= minute ventilation. VTi = inspiratory tidal volume; PBW=Predicted body weight; VAS= Visual Analogue Score).
