SummaryThe diagnosis of thromboembolic pulmonary hypertension and an assessment of the gravity of this disease is now possible by the study of the clinical, electrocardiographic and hemodynamic disturbances.The hemodynamic features are similar to those found in cases of peripheral stenoses of the pulmonary arteries. The phonocardiography findings are emphasized, in particular the presence of a continuous murmur which can often be heard over the entire lung and which finds its origin in the post-embolic stenoses of the pulmonary arteries. The therapeutic possibilities are discussed. It should be notetl that no definite data are available concerning the value of anticoagulant therapy.