Fig. 5
From: Variation of PetCO2 during incremental exercise and severity of IPAH and CTEPH
PetCO2 at rest, unloaded, AT, peak according to WHO-Fc(I-II and III-IV)in PAH patients. The PetCO2 at four time periods were proportionately reduced with increase of WHO-Fc in both IPAH and CTEPH patients. There was a significant difference in PetCO2 between WHO-Fc I-II and III-IV group in PAH patients, except for IPAH patients at rest and CTEPH patients at peak. Data are presented as mean ± SD. Statistical analysis was done by unpaired T test, and significant differences between two subgroups at the same time point are shown ** for P < 0.01, above value symbol