Differences in key gas exchange parameters between patients without PAH (group A), patients with PAH (group B) and patients with postcapillary PAH (group C)
| Group | Peak VO2 (mL/min/kg) | AT (mL/min/kg) | Peak O2 pulse (mL/beat) | VE/VCO2@AT (no unit) | Nadir VE/VCO2 (no unit) | PETCO2 @AT (mm Hg) | Peak PETCO2 (mm Hg) | PETCO2 difference peak–start (mm Hg) |
|---|---|---|---|---|---|---|---|---|
| (1) No PAH | 17.5±4.7 | 11.0±2.3 | 9.0±2.2 | 32.4±5.4 | 30.9±5.0 | 35.0±4.7 | 36.2±4.7 | 2.8±3.0 |
| (2) PAH | 11.0±2.9* | 8.0±2.2* | 6.8±1.9* | 44.7±12.2* | 43.0±10.5* | 26.8±7.1* | 27.7±6.7* | −0.5±2.7* |
| (3) Postcapillary PH | 13.9±3.1†‡ | 10.1±1.9† | 7.7±1.8 | 36.5±5.4†‡ | 35.5±5.6†‡ | 32.6±6.6† | 33.3±5.7† | 1.8±3.2‡ |
Values are presented as group mean±SD.
*p<0.001 group A vs group B.
†p<0.05 group B vs group C.
‡p<0.05 group A vs group C.
PAH, pulmonary arterial hypertension; PH, pulmonary hypertension.