Chronic thromboembolic pulmonary hypertension (CTEPH) is characterized by the persistence of thromboemboli in the form of organized tissue obstructing the pulmonary arteries. The consequence is an increase in pulmonary vascular resistance (PVR) resulting in pulmonary hypertension (PH) and progressive right heart failure. The disease is chronic thromboembolic pulmonary hypertension (EFO_0022954). Also known as: CTEPH.