Table 3. Changes in forced oscillatory parameters during the perioperative period.
| Parameters | Preoperative | POD1 | P value | POD7 | P value |
|---|---|---|---|---|---|
| R5 (cmH2O/L/s) | 2.28±0.68 | 2.77±0.84** | 0.000 | 2.75±0.88** | 0.000 |
| R20 (cmH2O/L/s) | 2.00±0.60 | 2.36±0.72** | 0.000 | 2.32±0.72** | 0.000 |
| R5-R20 (cmH2O/L/s) | 0.28±0.29 | 0.40±0.33* | 0.010 | 0.43±0.32** | 0.000 |
| X5 (cmH2O/L/s) | −0.31±0.30 | −0.65±0.43** | 0.000 | −0.56±0.40** | 0.000 |
| Fres (Hz) | 7.45±2.51 | 10.41±3.20** | 0.000 | 9.81±3.47** | 0.000 |
| ALX (cmH2O/L/s × Hz) | 1.33±1.63 | 3.27±2.94** | 0.000 | 2.84±2.77** | 0.000 |
*, P<0.05; **, P<0.01 versus preoperative scores. ALX, low-frequency reactance area; Fres, resonant frequency; R5, respiratory system resistance at 5 Hz; R20, respiratory system resistance at 20 Hz; R5-R20, the difference between R5 and R20; X5, respiratory system reactance at 5 Hz; POD, postoperative day.