Clinical Resources

Projected Aortic Valve Area

Low-Flow, Low-Gradient Aortic Stenosis — Blais Formula

AVA at Rest

cm²

Transvalvular Flow Rate (Q)

mL/s

SV (mL) ÷ Ejection Time (s) — typically 150–250 mL/s at rest

Results

Resting AVA —

Projected AVA at 250 mL/s —

Interpretation —

Enter resting AVA and flow rate above

Reference

Blais et al. 2006 — Projected valve area at normal flow rate improves the assessment of stenosis severity in patients with low-flow, low-gradient aortic stenosis. JACC 47(8):1638-44