title: Subaortic stenosis associated with systolic anterior motion.
abstract: Left ventricular outflow tract obstruction in children is classified according to the site of the obstruction into a supra-aortic type, valvular type, and subaortic type (subaortic stenosis). Subaortic stenosis, in turn, is classified into two major subtypes, i.e., a discrete type, which accounts for most cases and a tunnel type, and one minor subtype, the accessory mitral tissue type, which is rare. Systolic anterior motion (SAM) is a phenomenon that is commonly observed in hypertrophic cardiomyopathy. We report a rare case of subaortic stenosis associated with SAM, which was caused by cleft anterior mitral leaflet and an accessory papillary muscle. Surgical treatment was successful, and there were no complications.
authors.affiliation: Department of Cardiovascular Surgery, The Heart Institute of Japan, Tokyo Women's Medical University, 8-1 Kawada-cho, Shinjuku-ku, Tokyo 162-8666, Japan. siwata@hij.twmu.ac.jp
authors.forename: Yusuke
authors.initials: Y
authors.lastname: Iwata
authors.forename: Yasuharu
authors.initials: Y
authors.lastname: Imai
authors.forename: Toshiharu
authors.initials: T
authors.lastname: Shin'oka
authors.forename: Hiromi
authors.initials: H
authors.lastname: Kurosawa
mesh_terms: D000293:Adolescent; D006348:Cardiac Surgical Procedures / Q000379:methods; D002312:Cardiomyopathy, Hypertrophic / Q000150:complications* / Q000503:physiopathology; D003937:Diagnosis, Differential; D021922:Discrete Subaortic Stenosis / Q000175:diagnosis / Q000209:etiology* / Q000503:physiopathology; D017548:Echocardiography, Transesophageal; D005500:Follow-Up Studies; D006352:Heart Ventricles / Q000000981:diagnostic imaging; D006801:Humans; D008297:Male; D009200:Myocardial Contraction / Q000502:physiology*; D010210:Papillary Muscles / Q000002:abnormalities*; D013902:Radiography, Thoracic; D013599:Systole