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Maron BJ, Maron MS, Wigle D, et al. The 50-year history, controversy, and clinical implications of left ventricular outflow tract obstruction in hypertrophic cardiomyopathy. J. Am. Coll Cardiol 2009;54:191-200.

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• TITLE: The Murmur of Dynamic Subortic Stenosis Recognition Through A Novel Graphic Display

  AUTHORS: Morton E. Tavel

  KEYWORDS: Hypertrophic Cardiomyopathy; Cardiac Physical Diagnosis; Subaortic Stenosis; Heart Murmurs; Computer Analysis of Heart Sounds

  JOURNAL NAME: International Journal of Clinical Medicine, Vol.3 No.5, September 24, 2012

  ABSTRACT: Background: Dynamic subaortic stenosis occurs in differing situations, commonly with hypertrophic cardiomyopathy. Regardless of the underlying cause, the resulting murmurs usually possess a characteristic sound spectral pattern, manifesting a sharp and high frequency peak occurring late in systole, often bearing a striking resemblance to the subaortic Doppler flow pattern. Methods: Murmurs found in thirty one subjects with dynamic subaortic stenosis were analyzed after having been recorded with a novel portable device capable of spectral and waveform sound displays. Results: All subjects manifested characteristic frequency patterns, consisting of high and sharp peaks occurring in late systole. With significant subaortic stenosis (resting subaortic flow velocity > 2 m/sec) this pattern was evident at rest. In the presence of little or no resting subaortic obstruction (