Fig. 1
a Representative 3D color graph of postoperative respiratory resistance and reactance, measured using the MostGraph-01. The x-, y-, and z-axes show time, respiratory resistance (Rrs) or respiratory reactance (Xrs), and frequency (5–35 Hz), respectively. b Representative 2D graph of postoperative respiratory resistance and respiratory reactance measured using the MostGraph-01. Respiratory resistance (Rrs) was measured at 5 Hz (R5) and 20 Hz (R20), and their difference was calculated (R5 − R20; frequency dependence of respiratory resistance). Respiratory reactance (Xrs) was measured at 5 Hz (X5), as were Fres (frequency at a respiratory reactance of 0 cm H2O/L/s) and area of low respiratory reactance (ALX, the area made by three lines of frequency 5 Hz, Xrs = 0 cmH2O/L/s and the Xrs curve). Rrs and Xrs represent the average values of inspiratory and expiratory phases, respectively