Correlation between the mean pulmonary arterial pressure (mPAP)/cardiac output slope and parameters at rest and during the exercise
| r | p-value | |
| At rest | ||
| mPAP | 0.73 | <0.01 |
| Cardiac index | −0.15 | 0.41 |
| TPR | 0.64 | <0.01 |
| SpO2 | −0.03 | 0.89 |
| SvO2 | −0.15 | 0.42 |
| Vital capacity | 0.33 | 0.07 |
| FEV1/FVC | −0.15 | 0.42 |
| DLCO | 0.05 | 0.78 |
| At peak exercise | ||
| mPAP | 0.70 | <0.01 |
| Cardiac index | −0.60 | <0.01 |
| TPR | 0.80 | <0.01 |
| SpO2 | −0.19 | 0.29 |
| SvO2 | −0.15 | 0.40 |
TPR: total pulmonary resistance; SpO2: peripheral arterial oxygen saturation; SvO2: mixed venous oxygen saturation; FEV1: forced expiratory volume in 1 s; FVC: forced vital capacity; DLCO: diffusing capacity of the lung for carbon monoxide.