The percentage of the cross-sectional area of the regurgitation flow (CSA) to the area of the outflow tract of the left ventricle (CSA LVOT) can be used to evaluate the degree of the aortic regurgitation. (In practice, these parameters are often evaluated visually).
In the left parasternal position, the short axis of the heart at the level of the Ao valve, the cross-sectional area of the regurgitation flow is measured planimetrically (tracing).

The area of the outflow tract of the left ventricle is calculated by the formula:

 

 

DLVOT - Diameter of the Left Ventricular Outflow tract (LVOT).

 

Degree of the Aortic regurgitation by Jet area/LVOT area.

• Mild < 5 %
• Mild-Moderate 5 - 20 %
• Moderate-Severe 21-59 %
• Severe > 60 %

 

Left Parasternal View, the short axis at the level of Ao valve. Color Doppler. Measurement of the regurgitation jet area. Simulation By Echocardiography Online Simulator MyEchocardiography.com

 

Left Parasternal View, the Long axis of LV, Measurement of the Left Ventricular Outflow Tract (LVOT) Diameter. Using this parameter, the Echocardiography calculator will measure LVOT Area. Simulation By Echocardiography Online Simulator MyEchocardiography.com

 

 

ASE Guideline for Noninvasive Evaluation of Native Valvular Regurgitation

 

How to Simulate Assessment degree of Aortic Regurgitation by regurgitation jet Area / LVOT Area >>>

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