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Portions of two representative reports, a, c and e) one during noninvasive ventilation through a helmet and b, d and f) the other through mask. Tracings of a and b) airway pressure (Paw), c and d) flow and e and f) diaphragm electrical activity (EAdi) are shown. In a, c and e, two ineffective efforts are depicted, while two double-triggerings are depicted in b, d and f.
