Table 2.
Comparison between the echocardiographic data between the two groups
| Variables | Group type (mean±SD) | Paired t-test | ||
|---|---|---|---|---|
| Group 1 (6MWT <330 m) | Group 2 (6MWT ≥330 m) | t | P | |
| RV variables | ||||
| RV systolic pressure (mmHg) | 87.81±22.79 | 60.08±19.38 | 3.642 | 0.001 |
| Mean pulmonary artery pressure (mmHg) | 47.14±12.92 | 33.23±10.76 | 3.243 | 0.003 |
| RV base diameter (cm) | 4.41±0.83 | 4.05±0.54 | 1.385 | 0.176 |
| Indexed RV base diameter (cm/m2) | 2.97±0.81 | 3.26±1.09 | −0.889 | 0.381 |
| RV mid-diameter (cm) | 3.68±1 | 3.57±0.54 | 0.368 | 0.715 |
| Indexed RV mid-diameter (cm/m2) | 2.51±0.71 | 3.07±1.09 | −1.82 | 0.078 |
| RV longitudinal diameter (cm) | 7.43±1.41 | 7.23±1.27 | 0.422 | 0.676 |
| Indexed RV longitudinal (cm/m2) | 5.35±1.5 | 6.13±1.96 | −1.317 | 0.197 |
| RV outflow diameter (cm) | 2.39±0.72 | 2.13±0.33 | 1.223 | 0.23 |
| Indexed RV outflow diameter (cm/m2) | 1.75±0.67 | 1.88±0.72 | −0.512 | 0.612 |
| RA longitudinal dimension (cm) | 4.77±1.09 | 4.55±1 | 0.593 | 0.558 |
| Indexed RA longitudinal dimension (cm/m2) | 3.46±1.2 | 3.9±1.37 | −0.975 | 0.337 |
| RA transverse dimension (cm) | 4.37±1.33 | 3.74±0.91 | 1.499 | 0.144 |
| Indexed RA transverse dimension (cm/m2) | 3.18±1.24 | 3.2±1.22 | −0.055 | 0.957 |
| Inferior venae cava (cm) | 1.45±0.34 | 1.25±0.25 | 1.882 | 0.069 |
| TAPSE (cm) | 1.71±0.18 | 1.8±0.19 | 1.397 | 0.172 |
| Fractional area change (%) | 37.07±5.54 | 40.92±4.77 | −2.074 | 0.046 |
| RV wall thickness (cm) | 0.88±0.21 | 0.72±0.19 | 2.190 | 0.036 |
| RV global longitudinal strain (%) | −19.33±3.55 | −22.53±5.23 | −2.127 | 0.041 |
| Ś of RV free wall (cm/sec) | 10.62±1.83 | 11.38±1.71 | −1.215 | 0.233 |
| É of RV free wall (cm/sec) | 11±2.28 | 12.08±1.98 | −1.405 | 0.170 |
| RV myocardial performance index | 0.54±0.07 | 0.48±0.09 | 2.405 | 0.022 |
| LV variables | ||||
| EF by M-mode (%) | 63.23±6.54 | 66.85±4.65 | −1.732 | 0.093 |
| EF by Simpson’s method (%) | 58.00±6.99 | 61.69±4.68 | −1.682 | 0.102 |
| LVEDD (cm) | 4.38±0.69 | 4.08±0.76 | 1.205 | 0.237 |
| indexed LVEDD (cm/m2) | 3.06±0.81 | 3.23±0.94 | −0.571 | 0.572 |
| LVESD (cm) | 3.1±0.61 | 2.78±0.63 | 1.460 | 0.154 |
| Indexed LVESD (cm/m2) | 2.37±0.89 | 2.31±0.65 | 0.207 | 0.837 |
| E’ LV septal wall (cm/s) | 10.52±2.86 | 12.31±1.6 | −2.053 | 0.048 |
| E’ LV lateral wall | 11.62±2.77 | 14.15±1.86 | −2.912 | 0.006 |
| E/A ratio | 0.95±0.28 | 1.24±0.26 | −3.033 | 0.005 |
| E/e’ | 8.79±1.53 | 7.26±1.04 | 3.143 | 0.004 |
| LV myocardial performance index | 0.51±0.08 | 0.42±0.06 | 3.440 | 0.002 |
| LV global longitudinal strain | −18.58±4.09 | −20.91±2.99 | 1.776 | 0.085 |
| LV global circumferential strain | −14.08±7.2 | −15.75±11.11 | 0.536 | 0.596 |
| LV global radial strain | 29.31±5.47 | 39.52±8.39 | −4.307 | 0.000 |
| Oxygen saturation | ||||
| Saturation (%) before | 89.86±6.39 | 95.85±2.61 | −3.203 | 0.003 |
| Saturation (%) after | 85.24±9.39 | 94.46±3.95 | −3.347 | 0.002 |
| Desaturation value | 4.62±3.46 | 1.38±1.66 | 3.143 | 0.004 |
TAPSE=Tricuspid annular plan systolic excursion, LVEDD=Left ventricle end-diastolic dimension, LVESD=Left ventricle end-systolic dimension, LV=Left ventricle, RV=Right ventricle, SD=Standard deviation, 6MWT=6-min walk test