What are the causes of 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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Most cases of aortic stenosis are due to the obstruction at the valvular level. Common causes are summarized in Table 1.

Table 1. Common Causes of Aortic Stenosis Among Patients Requiring Surgery (Open Table in a new window)

Age <70 years (n=324)

Age >70 years (n=322)

Bicuspid AV (50%)

Postinflammatory (25%)

Degenerative (18%)

Unicommissural (3%)

Hypoplastic (2%)

Indeterminate (2%)

Degenerative (48%)

Bicuspid (27%)

Postinflammatory (23%)

Hypoplastic (2%)

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