# Mitral Valve Area (MVA) by Pressure Half Time

#### Reference Values

 Mitral Stenosis Severity MVA (cm2) Normal 4.0-5.0 Mild 1.5-4.0 Moderate 1.0-1.5 Severe <1.0

#### Formula

$MVA = \frac{220}{PHT}$

#### Definitions

 PHT Pressure half-time MVA Mitral valve area

#### Reference

 1 Baumgartner H, et al. Echocardiographic assessment of valve stenosis: EAE/ASE recommendations for clinical practice. J Am Soc Echocardiogr. 2009 Jan;22(1):14, 17. Full text

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Developer & Illustrator: Sirikarn Napan, MD, FACC