Aortic stenosis severity grading

Parameter
Normal
Mild
Moderate
Severe
Vmax (m/sec)

<2.5

2.6-2.9

3-4

>4

Pmax (mmHg)

<16

<36

36-64

>65

Pmean (mmHg)

25

<20

20-40

>40

AVA

>2.5

>1.5

1-1.5

<1

Indexed AVA

n/a

>0.85

0.6-0.85

<0.6

Velocity ratio (LVOT:AV VTI) = DSI

n/a

>0.5

0.25-0.5

<0.25