Chronic thromboembolic pulmonary hypertension (CTEPH)  is a subform of pulmonary hypertension that involves obstruction or restriction of the pulmonary arteries.

CTEPH.....

• is characterized by a permanent pulmonary arterial branch occlusion with increasing compressive and volume load of the heart,

• is, due to its vast clinical problems and chronically increasing course, involved with an extraordinary burden and restriction of the day-to-day ability of affected patients and can, if left untreated, lead to death.