Classification

Used to monitor disease progression and determine the need for intervention

Based on echocardiographic criteria of valve anatomy and hemodynamics

• Aortic valve area (AVA): the opening area of the aortic valve measured during systole and an important factor in the evaluation of severity of aortic valve stenosis

• Mean aortic pressure gradient: the difference in pressure between the left ventricle and the ascending aorta during systole

  • Pressures normally equilibrate relatively rapidly when the valve opens.

  • Valvular stenosis limits the increase in aortic pressure while increasing the LV pressure, leading to a higher gradient.