title: Primary pulmonary hypertension of unusually long duration.
mesh_terms: D000293:Adolescent; D000328:Adult; D001794:Blood Pressure; D006328:Cardiac Catheterization; D006332:Cardiomegaly / Q000150:complications; D002648:Child; D002908:Chronic Disease; D004562:Electrocardiography; D006801:Humans; D006976:Hypertension, Pulmonary / Q000151:congenital / Q000209:etiology*; D008168:Lung / Q000473:pathology; D008297:Male; D005082:Physical Exertion; D011651:Pulmonary Artery; D013575:Syncope / Q000209:etiology; D013997:Time Factors