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Table 2 Relationships between spirometry and preoperative FOT findings

From: Perioperative evaluation of respiratory impedance using the forced oscillation technique: a prospective observational study

  %VC   %FEV1.0   %FVC   FEV1.0/FVC ratio  
Coefficient p value Coefficient p value Coefficient p value Coefficient p value
Preoperative R5 (cmH2O/L/s) −0.371 0.0623 −0.381 0.0551 −0.319 0.1129 −0.222 0.2751
Preoperative R20 (cmH2O/L/s) −0.326 0.1036 −0.338 0.0915 −0.294 0.1455 −0.167 0.4139
Preoperative R5-R20 (cmH2O/L/s) −0.268 0.1855 −0.340 0.0897 −0.191 0.3505 −0.354 0.0758
Preoperative X5 (cmH2O/L/s) 0.595 0.0013* 0.526 0.0058* 0.555 0.0033* 0.176 0.3911
Preoperative Fres (Hz) −0.642 0.0001* −0.573 0.0022* −0.599 0.0012* −0.227 0.2640
Preoperative ALX (cmH2O/L) −0.615 0.0008* −0.558 0.0030* −0.573 0.0022* −0.221 0.2790
  1. Abbreviations: R5 respiratory resistance at 5 Hz, R20 respiratory resistance at 20 Hz, X5 respiratory reactance at 5 Hz, Fres resonance frequency, ALX area of low respiratory reactance, VC vital capacity, FVC forced vital capacity, FEV1.0 forced expiratory volume in the first second. *P < 0.01