Treatment algorithm for chronic thromboembolic pulmonary hypertension. Treatment algorithm for chronic thromboembolic pulmonary hypertension. BPA: balloon pulmonary angioplasty; CTEPH: chronic thromboembolic pulmonary hypertension; PH: pulmonary hypertension. aTechnically operable patients with non-acceptable risk/benefit ratio can be considered also for BPA. bIn some centers medical therapy and BPA are initiated concurrently. Nazzareno Galiè et al. Eur Respir J 2015;46:903-975 ©2015 by European Respiratory Society