Estimate aortic valve area
Derivation of valve area is based the continuity equation which states that the flow passing through the LVOT has to equal the flow through the AV. Echocardiographic derived measurements are based on maximal instantaneous gradient which provide a more accurate assessment then non-physiologic peak-to-peak gradients observed on invasive studies. In general, the VTI (cm) is felt provide a more accurate assessment of valve area however peak velocity (m/sec) can also be used.
The normal aortic valve area is 3-4 cm2. Symptoms tend to not be apparent until the AS is severe (<1cm2). If a patient presents with symptoms and the AVA is measured in the mild-moderate range alternative causes should be explored before attributing them to AS alone.
Robert O Bonow, Blase A Carabello et al.
Oh J, Seward JB, Tajik AJ.
Kern MJ.
Derivation of valve area is based the continuity equation which states that the flow passing through the LVOT has to equal the flow through the AV. Echocardiographic derived measurements are based on maximal instantaneous gradient which provide a more accurate assessment then non-physiologic peak-to-peak gradients observed on invasive studies. In general, the VTI (cm) is felt provide a more accurate assessment of valve area however peak velocity (m/sec) can also be used.
The normal aortic valve area is 3-4 cm2. Symptoms tend to not be apparent until the AS is severe (<1cm2). If a patient presents with symptoms and the AVA is measured in the mild-moderate range alternative causes should be explored before attributing them to AS alone.
Robert O Bonow, Blase A Carabello et al.
Oh J, Seward JB, Tajik AJ.
Kern MJ.
© 2020 QxMD Software Inc., all rights reserved. No part of this service may be reproduced in any way without express written consent of QxMD. This information should not be used for the diagnosis or treatment of any health problem or disease. This information is not intended to replace clinical judgment or guide individual patient care in any manner. Click here for full notice and disclaimer.
