PTPA and chronic thromboembolic pulmonary hypertension: In our results, the interventional therapies, PEA and PTPA, resulted in a 98% 5-year survival from diagnosis, suggesting the possibility that the prognosis of patients with CTEPH has improved in the recent era, in which both PEA and PTPA can be chosen, compared to that in the previous era, when PEA was the only choice of interventional therapy.