Fig. 1
From: Variation of PetCO2 during incremental exercise and severity of IPAH and CTEPH
PetCO2 differences among the three groups during incremental exercise test. The kinetics of changes in PetCO2 among three groups, the mean ± SD of PetCO2 in IPAH, CTEPH and control group at different stages of exercise: rest, unloaded, AT, peak are shown in Fig. 1. *P < 0.001, control group versus IPAH group and control group versus CTEPH; # P < 0.001, IPAH group versus. CTEPH group