Background: Chronic thromboembolic pulmonary hypertension leads to pulmonary hypertension and right-sided heart failure. The purpose of this study was to investigate the efficacy of percutaneous transluminal pulmonary angioplasty (PTPA) for the treatment of chronic thromboembolic pulmonary hypertension.
Methods And Results: Twenty-nine patients with chronic thromboembolic pulmonary hypertension underwent PTPA. One patient had a wiring perforation as a complication of PTPA and died 2 days after the procedure. In the remaining 28 patients, PTPA did not produce immediate hemodynamic improvement at the time of the procedure. However, after follow-up (6.0 ± 6.9 months), New York Heart Association functional classifications and levels of plasma B-type natriuretic peptide significantly improved (both P<0.01). Hemodynamic parameters also significantly improved (mean pulmonary arterial pressure, 45.3 ± 9.8 versus 31.8 ± 10.0 mm Hg; cardiac output, 3.6 ± 1.2 versus 4.6 ± 1.7 L/min, baseline versus follow-up, respectively; both P<0.01). Twenty-seven of 51 procedures in total (53%), and 19 of 28 first procedures (68%), had reperfusion pulmonary edema as the chief complication. Patients with severe clinical signs and/or severe hemodynamics at baseline had a high risk of reperfusion pulmonary edema.
Conclusions: PTPA improved subjective symptoms and objective variables, including pulmonary hemodynamics. PTPA may be a promising therapeutic strategy for the treatment of chronic thromboembolic pulmonary hypertension.
Clinical Trial Registration: URL: http://www.umin.ac.jp. Unique identifier: UMIN000001572.
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