Chronic thromboembolic pulmonary hypertension (CTEPH) is a specific type of pulmonary hypertension (PH) and the major component of Group 4 pulmonary hypertension (PH). It is caused by pulmonary vasculature obstruction that leads to a progressive increase in pulmonary vascular resistance and. ultimately. to failure of the right ventricle. https://www.roamingfreesims.com/product-category/osram-qt-ballasts/