Aortic Stenosis Severity Classification



Mild AS:

 • Valve Area > 1.5 cm2

 • Mean Gradient < 20 mmHg

 • Peak Velocity < 3 m/s



Moderate AS:

 • Valve Area 1-1.5 cm2

 • Mean Gradient 20-40 mmHg

 • Peak Velocity 3-4 m/s



Severe AS:

 • Valve Area < 1.0 cm2

 • Mean Gradient > 40 mmHg

 • Peak Velocity > 4 m/s



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