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Updated: Jun 27, 2026

A Minimally Invasive Model of Aortic Stenosis in Swine
Published on: October 20, 2023
Subaortic stenosis associated with systolic anterior motion
Yusuke Iwata1, Yasuharu Imai, Toshiharu Shin'oka
1Department 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
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.
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