Continuity Equation (AVA)

Name: Continuity Equation (AVA)
Creator: Daniel Diaz-Gil, MD
Keywords: cardiology, continuity equation, aortic valve area, AVA, LVOT, VTI, aortic stenosis, echocardiography, hemodynamics

Calculates aortic valve area using the continuity equation with LVOT diameter and VTI measurements

Clinically Verified· 5 tests

For educational and informational purposes only. Verify all results before clinical application.

LVOT Diameter *

LVOT VTI *

Aortic Valve VTI *

Body Surface Area (m²)

m²

Optional: enter BSA for indexed values Body Surface Area (BSA)

References

Baumgartner H, et al. Recommendations on the echocardiographic assessment of aortic valve stenosis. Eur Heart J. 2009;30(1):1-13.[DOI]
Otto CM, et al. Determination of the stenotic aortic valve area in adults using Doppler echocardiography. J Am Coll Cardiol. 1986;7(3):509-517.[DOI]

Reviewed by Daniel Diaz-Gil, MD · Last updated March 2026

Medical disclaimer

This tool is for educational and informational purposes only. It is not a substitute for professional clinical judgment. Always independently verify results before making clinical decisions.

Professional Resources — Tools used by pediatricians for valve area calculation

Park's Pediatric Cardiology for Practitioners, 7th EdComprehensive reference for pediatric cardiology evaluation and management~$95via Amazon Echocardiography in Pediatric and Congenital Heart Disease, Lai et alDefinitive echo reference with z-score tables and imaging protocols~$180via Amazon BoardVitals Pediatric Cardiology QbankBoard-style questions for pediatric cardiology certificationsubscriptionvia BoardVitals