Figure 2
From: Chest wall mechanics during pressure support ventilation
Relationship between Vt and respiratory rate. Shown is the relationship between Vt and respiratory rate (f) in the patients at different levels of pressure support: 5 cmH2O (closed circles), 10 cmH2O (open circles), 15 cmH2O (closed squares) and 25 cmH2O (open squares). The straight lines represent isopleths of different values of f/Vt (20, 40, 60, 80 and 100 l-1·min-1). The curved line is the fitting of data points by the following equation: f = K/Vt (where K = 7.9385 ± 0.4324). PS, pressure support; Vt, tidal volume.