Fig. 2
From: Variation of PetCO2 during incremental exercise and severity of IPAH and CTEPH
PetCO2 patterns during exercise in eight representative subjects with IPAH and CTEPH with relation to severity of exercise limitation. Data were recorded every 10-s. The course of incremental CPET included 3Â min of rest, 3Â min of unloaded pedaling, followed by a gradually increasing workload exercise until peak, and eventually 3Â min of recovery. The red arrows denote peak point in each IPAH subgroup and black arrows is the time of peak in each CTEPH subgroup