DEGREE OF AORTIC STENOSIS BY AORTIC VALVE AREA (AVA)
Echocardiography Textbook
The best indicator of the severity of aortic stenosis is the area of the aortic valve opening. It is calculated from the flow continuity equation. The flow in the output tract of the left ventricle is studied in pulseless wave mode, in the aorta in continuous wave mode The calculation is based on the flow continuity equation, according to which the stroke volume of the flow in the left ventricular outflow tract is equal to the stroke volume of the transaortic flow:
AVA - Aortic valve orifice area. CSALVOT - left ventricular outflow tract area.
D - diameter of the base of the aorta. VTILVOT - integral of the linear velocity of the flow in the LV outflow tract. VTIAO - integral of the linear velocity of the flow in the Aorta.
Left Parasternal View. The long axis. Mitral Stenosis. Measurement of the D - diameter of the base of the aorta. Simulation by Echocardiography Online Simulator MyEchocardiography.com
Apical 5 Chamber View. Mitral Stenosis . PW Doppler. Measurement of the VTI LVOT. Simulation by Echocardiography Online Simulator MyEchocardiography.com
Apical 5 Chamber View. Mitral Stenosis . CW Doppler. Measurement of the VTI Ao. Simulation by Echocardiography Online Simulator MyEchocardiography.com