Fig. 8. Individual changes in work of breathing (ΔWOB in J/min) and in airway occlusion pressure (ΔP0.1t) observed during changes in external positive end-expiratory pressure (PEEP) from 0 to 5 cm H2O (triangles) and from 5 to 10 cm H2O (squares). Only 1 of 20 patients exhibited a clear increase in P0.1t(+ 1 cm H2O), whereas WOB decreased (−5 J/min; ρ= 0.47;P = 0.003). In every case in which the addition of PEEP increased the WOB, P0.1talso increased.

Fig. 8. Individual changes in work of breathing (ΔWOB in J/min) and in airway occlusion pressure (ΔP0.1t) observed during changes in external positive end-expiratory pressure (PEEP) from 0 to 5 cm H2O (triangles) and from 5 to 10 cm H2O (squares). Only 1 of 20 patients exhibited a clear increase in P0.1t(+ 1 cm H2O), whereas WOB decreased (−5 J/min; ρ= 0.47;P = 0.003). In every case in which the addition of PEEP increased the WOB, P0.1talso increased.

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