Fig. 4
Driving pressure (∆P), tidal volume (Vt) coefficient of variation, respiratory drive and electrical activity of diaphragm at the costal margin (EADi,surf) and intercostal muscles (Intercost,surf) results after a conceptual reorganization on a common “pressure-muscle-index (PMI) axis”. To consider the different individual responses to variation of assistance, data were reorganized so that the five PS levels studied in each patient were shifted, taking as a common reference the PS level at which PMI was the closest possible to disappear (PSPMI=0) therefore obtaining a total of 8 PS “bins”, each containing a certain number of the 18 patients studied. Data are shown as mean ± SD. RR, respiratory rate