Fig. 4.
Dependence of respiratory mechanics on positive end-expiratory pressure (PEEP) in chronic obstructive pulmonary disease (COPD) patients mechanically ventilated because of acute exacerbation of the disease (AECOPD) or because of other indications (COPD). Mean values of Newtonian resistance (RN), tissue damping (G), elastance (H), and hysteresivity (η) at transrespiratory pressures of 5, 7, 10, and 13 cmH2O. Bars indicate SE. Values of P show the significance of differences between the 2 groups. [Reproduced with permission from Lorx et al. (53).]