Henry Ford Hospital Medical Journal


The purpose of this study is to explore the value of intracardiac sound recordings for the verification of subaortic stenosis. Intracardiac sound was measured in ten patients with subaortic obstructions. Seven had idiopathic hypertrophic subaortic stenosis, two had a subvalvular membrane, and one had a subvalvular tunnel. In each patient, a systolic murmur was recorded within the left ventricle distal to the obstruction. The murmur was of lower amplitude distal to the aortic valve, and it was of even lower amplitude or absent proximal to the obstruction. In the presence of entrapment, no intraventricular murmur occurred although an apparent subvalvular pressure gradient was observed. The identification and localization of the maximal intensity of a systolic murmur in the ventricular outflow tract may assist in the verification of a subvalvular obstruction and help distinguish between artifactual pressure gradients and gradients indicative of subvalvular stenosis.



To view the content in your browser, please download Adobe Reader or, alternately,
you may Download the file to your hard drive.

NOTE: The latest versions of Adobe Reader do not support viewing PDF files within Firefox on Mac OS and if you are using a modern (Intel) Mac, there is no official plugin for viewing PDF files within the browser window.