https://www.templehealth.org/sites/default/files/inline-files/cteph-patient-guide-100220.pdf
Chronic thromboembolic pulmonary hypertension (CTEPH) is a specific type of pulmonary hypertension caused by blood clots in the lung blood vessels. Other more common causes of pulmonary hypertension include chronic lung disease and chronic heart disease, such as weakened left heart or faulty heart valve.