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Classification of non-invasive respiratory support—according to the set parameter (pressure vs. flow). Pressure-controlled modalities are classified further based on the pressure generated (constant flow vs. variable flow). The associated ventilatory modalities are reported for each sub-classification. NIV, non-invasive ventilation; CPAP, continuous positive airway pressure; nCPAP, nasal CPAP; nIPPV, nasal intermittent positive pressure ventilation; HFNC, high flow nasal cannula
