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Upper panel: airway pressure (Paw), oropharyngeal pressure (OPP), and flow tracings in a young child undergoing nasopharyngeal tube‐assisted anesthesia with 4% sevoflurane in oxygen (S/O2); lower panel: tracings of Paw, measured OPP (mOPP) and calculated OPP (cOPP) using oxygen (O2) and the four sevoflurane combinations [Colour figure can be viewed at wileyonlinelibrary.com]
