What are characteristics of the classic crescendo-decrescendo systolic murmur in aortic stenosis (AS)?

Updated: May 07, 2019
  • Author: Xiushui (Mike) Ren, MD; Chief Editor: Terrence X O'Brien, MD, MS, FACC  more...
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The classic crescendo-decrescendo systolic murmur of aortic stenosis begins shortly after the first heart sound. The intensity increases toward midsystole, then decreases, and the murmur ends just before the second heart sound. It is generally a rough, low-pitched sound that is best heard at the second intercostal space in the right upper sternal border. It is harsh at the base and radiates to 1 or both carotid arteries.

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