Pulmonary endarterectomy improves outcomes in patients with segmental disease A new study, presented today at the AATS 101st Annual Meeting, found that patients treated surgically for segmental Chronic Thromboembolic Pulmonary Hypertension (CTEPH) had excellent outcomes with the vast majority doing very well in the long term without any additional treatment other than surgery. In addition, the study found that the proportion of CTEPH patients with segmental disease increased dramatically during the study period - from 2005 to 2020. At the beginning of the study, roughly seven percent of patients were diagnosed with segmental disease. During the last five years of the study, the proportion rose to an average of 41 percent of patients.