Fig. 1From: Accuracy of delivered airway pressure and work of breathing estimation during proportional assist ventilation: a bench studyPercentage of difference between measured airway pressure (\(P_{{{\text{aw}}_{\text{meas}} }}\)) and theoretical airway pressure (\(P_{{{\text{aw}}_{\text{th}} }}\)) (%ΔP aw) at 25, 50, 75 and 100 % of inspiration with different lung mechanics with gain 30 % (a) and 60 % (b). %ΔP aw is expressed in percentage of \(P_{{{\text{aw}}_{\text{th}} }}\) (%ΔP aw = (\(P_{{{\text{aw}}_{\text{meas}} }}\) − \(P_{{{\text{aw}}_{\text{th}} }}\))/\(P_{{{\text{aw}}_{\text{th}} }}\) × 100). Representative tracing of \(P_{{{\text{aw}}_{\text{meas}} }}\) and \(P_{{{\text{aw}}_{\text{th}} }}\) in 4 respiratory mechanics with gain 30 % (c) and 60 % (d). Black lines \(P_{{{\text{aw}}_{\text{th}} }}\) waveforms; blue lines \(P_{{{\text{aw}}_{\text{meas}} }}\) waveforms. Inspiratory trigger = 5 L/min; muscular pressure = 10 cmH2O; PEEP = 5 cmH2O; respiratory rate = 20/min. Respiratory mechanics; normal: resistance (R) = 10 cmH2O/L/s and compliance (C) = 60 mL/cmH2O; obstructive: R = 20 cmH2O/L/s and C = 60 mL/cmH2O; restrictive: R = 10 cmH2O/L/s and C = 30 mL/cmH2O; and mixed: R = 20 cmH2O/L/s and C = 30 mL/cmH2OBack to article page