Fig. 2
A, B Kaplan–Meier survival curves stratified by the presence of tissue hypoxia (PvO2 < 35 mmHg) in patients with CTEPH. A PEA/BPA group (P = 0.445). B PH medication group (P = 0.017). C Comparison among the PEA/BPA, PH medication, and supportive groups in the absence of tissue hypoxia (P = 0.002). There is no significant difference in survival between the PEA/BPA and PH medication groups (P = 0.366). D Comparison among the three groups in the presence of tissue hypoxia (P < 0.001). The PEA/BPA group exhibits better survival than the PH medication group (P < 0.001). BPA balloon pulmonary angioplasty, CTEPH chronic thromboembolic pulmonary hypertension, PEA pulmonary endarterectomy, PH pulmonary hypertension, PvO2 mixed venous oxygen tension