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Upper graph shows proximal airway pressure (Paw), flow‐dependent pressure drop (ΔPNPT) and oropharyngeal pressure (OPP) over time during continuous positive pressure ventilation (CPAP) at 12 L/min using a 3.5 mm NPT. Lower graph shows Paw, ΔPNPT and OPP over time during intermittent positive pressure ventilation (IPPV), peak inspiratory pressure (PIP) of 25 cmH2O, using a 3.5 mm NPT. A point to point subtraction of ΔPNPT from Paw yielded OPP
