Outcomes of Pulmonary Endarterectomy for Chronic Thromboembolic Pulmonary Hypertension at a Single Center in Taiwan.

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Chronic thromboembolic pulmonary hypertension (CTEPH) is classified as group IV pulmonary hypertension. This study aimed to report our institutional experience in managing CTEPH. We prospectively collected the data of 23 patients diagnosed with CTEPH between August 2001 and August 2017 in Linkou Chang Gung Memorial Hospital. Baseline characteristics including functional class (FC), 6-minute walk distance (6MWD), comorbidities, hematological and biochemical data, echocardiography, cardiac catheterization, and selective pulmonary angiography were recorded at diagnosis. All patients were referred to a cardiac surgeon for pulmonary endarterectomy (PEA) assessment. The mean age at diagnosis was 48.4 ± 16.1 years. Nineteen patients (83%) underwent PEA with mean postoperative follow-up of 37.7 ± 42.8 months. The in-hospital mortality rate of PEA was 11%. The 1-, 2-, 3- and 5-year overall survival rates were 89%, 89%, 81%, and 50%, respectively. After 3 months of PEA, all patients had improvements in FC, 6MWD (from 326 ± 62 to 420 ± 63 m), B-type natriuretic peptide level (from 602 ± 599 to 268 ± 565 pg/mL), and systolic pulmonary artery pressure (from 79 ± 19 to 48 ± 19 mmHg). The patients with proximal disease (Jamieson type 1 or 2) had better survival than those with distal disease (Jamieson type 3 or 4), but there was no significant difference in mortality between FC III and IV. All of the four patients who did not undergo PEA survived for more than 3 years. Significant improvements in symptoms, functional capacity, and hemodynamics were achieved in the CTEPH patients after PEA. However, the overall survival was still unsatisfactory.