TABLE 2.
Mechanical parameters obtained via respiratory oscillometry characterizing airflow resistance at oscillation frequencies of 5 and 19 Hz (R5, R19), and their difference (R5–R19) reflecting the frequency dependence of the real part of the respiratory impedance spectra, area under the reactance curve at 5 Hz, and the resonant frequency (AX5) and the resonant frequency (fres).
| Group H | Group COVID | p | ||
| R5 | Absolute value (cmH2O.s/l) | 3.22 ± 1.13 | 3.31 ± 0.58 | 0.84 |
| % predicted | 101.8 ± 27.7 | 89.9 ± 21.8 | 0.33 | |
| Z score | -0.06 ± 0.94 | -0.47 ± 0.91 | 0.36 | |
| R19 | Absolute value (cmH2O.s/l) | 3.21 ± 1.03 | 2.90 ± 0.40 | 0.42 |
| % predicted | 106.5 ± 27.7 | 87.9 ± 18.6 | 0.12 | |
| Z score | 0.10 ± 0.93 | -0.59 ± 0.85 | 0.12 | |
| R5–R19 | Absolute value (cmH2O.s/l) | 0.013 ± 0.23 | 0.411 ± 0.26 | 0.003 |
| AX5 | Absolute value (cmH2O/l) | 3.20 ± 3.29 | 6.24 ± 3.31 | 0.02 |
| % predicted | 93.99 ± 37.6 | 181.1 ± 111.9 | 0.03 | |
| Z score | -0.21 ± 0.67 | 0.62 ± 0.79 | 0.03 | |
| fres | Absolute value (Hz) | 12.2 ± 3.6 | 15.7 ± 2.6 | 0.03 |
| % predicted | 99.1 ± 25.6 | 114.6 ± 18.9 | 0.04 | |
| Z score | -0.24 ± 0.80 | 0.52 ± 0.65 | 0.04 |
Data were obtained at 6 months after hospital discharge in patients requiring veno-venous extracorporeal membrane oxygenation in the acute phase of coronavirus disease 2019 (Group COVID) and in healthy matched controls (Group H). Data were reported as absolute values, percent predicted, and Z-scores, where the latter two are available. Bold values: statistically significant difference.