title: Auscultatorily silent patent ductus arteriosus. Report of two cases with normal pulmonary pressures.
mesh_terms: D000328:Adult; D001022:Aortic Valve Insufficiency / Q000150:complications; D001794:Blood Pressure; D006328:Cardiac Catheterization; D002648:Child; D004374:Ductus Arteriosus, Patent / Q000175:diagnosis* / Q000000981:diagnostic imaging; D005260:Female; D006326:Heart Auscultation; D006343:Heart Septal Defects / Q000150:complications; D006801:Humans; D006859:Hydrogen; D007201:Indicator Dilution Techniques; D011651:Pulmonary Artery / Q000000981:diagnostic imaging; D011652:Pulmonary Circulation; D011859:Radiography
chemical_list: D006859:Hydrogen