Table 1

Definitions of Mild, Moderate, and Severe Aortic Stenosis

Peak-to-Peak Systolic Gradient (Catherization)Mean Echo Doppler Gradient (CW)Peak Instantaneous Echo Doppler Gradient (CW)
Mild ASless than 30 mm Hgless than 25 mm Hgless than 40 mm Hg
Moderate AS30 to 50 mm Hg25 to 40 mm Hg40 to 70 mm Hg
Severe ASgreater than 50 mm Hggreater than 40 mm Hggreater than 70 mm Hg
  • Gradients obtained from apical window usually most predictive of catheter gradient.