Comparative evaluation of three interfaces for non-invasive ventilation: a randomized cross-over design physiologic study on healthy volunteers

Table 2 Main ventilatory variables and inspiratory effort following interventions, at increased settings, with group means differences between FM and SB versus HS and HN

Data are presented as mean ± SD and group mean differences ± SD. Data following intervention; n = 12 healthy volunteers included. Increased settings for H_S and H_N were PEEP 8 cmH₂O; PS 8 cmH₂O, Ramp 0; Exp trigger: 25%; FiO₂: 21%. Data were analyzed with a generalized linear mixed-effects model for repeated measures, ^*P <0.0125. V_T, tidal volume; V_E, minute ventilation; RRn, neural respiratory rate; PTPdi, pressure-time product of the transdiaphragmatic pressure; WOB, work of breathing; FM, face mask; H_S, helmet standard; H_N, helmet next; SB_I, initial spontaneous breathing; SB_E, end spontaneous breathing; PEEP, positive end-expiratory pressure; PS, pressure support; Exp trigger, expiratory trigger; delay, TR-insp, inspiratory trigger delay; Delay,TR-exp, expiratory trigger delay; TI,Synchrony, synchrony time as% of patient inspiratory time; NA, not applicable.

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