title: The occurrence of primary pulmonary hypertension in twins with a review of etiological considerations.
mesh_terms: D000328:Adult; D001163:Arteriovenous Anastomosis / Q000502:physiology; D004200:Diseases in Twins; D004562:Electrocardiography; D005260:Female; D006801:Humans; D006976:Hypertension, Pulmonary / Q000209:etiology* / Q000235:genetics / Q000503:physiopathology; D007231:Infant, Newborn; D010547:Persistent Fetal Circulation Syndrome / Q000150:complications; D011651:Pulmonary Artery / Q000473:pathology / Q000503:physiopathology; D011655:Pulmonary Embolism / Q000150:complications; D013902:Radiography, Thoracic; D012008:Recurrence; D014661:Vasoconstriction