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Table 3 Relationships between spirometry and postoperative 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
Postoperative R5 (cmH2O/L/s) −0.285 0.1585 −0.290 0.1513 −0.262 0.1968 −0.097 0.6358
Postoperative R20 (cmH2O/L/s) −0.180 0.3785 −0.283 0.1617 −0.171 0.4028 −0.197 0.3358
Postoperative R5-R20 (cmH2O/L/s) −0.437 0.0256 −0.320 0.1113 −0.396 0.0450 0.029 0.8866
Postoperative X5 (cmH2O/L/s) 0.672 0.0002* 0.720 <0.0001* 0.684 0.0001* 0.336 0.0935
Postoperative Fres (Hz) −0.742 <0.0001* −0.708 <0.0001* −0.741 <0.0001* −0.229 0.2602
Postoperative ALX (cmH2O/L) −0.699 <0.0001* −0.734 <0.0001* −0.706 <0.0001* −0.335 0.0939
  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