What is chronic thromboembolic pulmonary hypertension (CTEPH)?

What is chronic thromboembolic pulmonary hypertension (CTEPH)?

The lungs and heart must exert pressure to move blood throughout the body. CTEPH is high blood pressure in the arteries in the pulmonary system (lungs). This is caused by clots in the blood vessels that last after at least three months on blood thinners. The clots typically leave scar tissue in the arteries.