Which measurement defines the MS severity categories (mild, moderate, severe) in the provided data?

Which measurement defines the MS severity categories (mild, moderate, severe) in the provided data?

• A. PHT
• B. Deceleration Time
• C. Mitral Valve Area (MVA)
• D. E Velocity

Answer: (C)

Mitral valve area (MVA) is the measurement that defines the severity categories of mitral stenosis. The opening size of the valve directly limits how much blood can pass during diastole, so smaller areas correspond to greater obstruction and higher gradients. Clinically, MVA is determined by planimetry or 3D echo, and it can also be estimated by Doppler methods such as the pressure half-time (MVA ≈ 220/PHT), but the classification into mild, moderate, or severe relies on the actual valve area value. Typical thresholds are roughly mild >1.5 cm², moderate 1.0–1.5 cm², and severe <1.0 cm². Other Doppler measurements like E velocity or deceleration time reflect filling dynamics and loading conditions and can support the assessment, but they are not the primary criteria used to define MS severity.

Mitral valve area (MVA) is the measurement that defines the severity categories of mitral stenosis. The opening size of the valve directly limits how much blood can pass during diastole, so smaller areas correspond to greater obstruction and higher gradients. Clinically, MVA is determined by planimetry or 3D echo, and it can also be estimated by Doppler methods such as the pressure half-time (MVA ≈ 220/PHT), but the classification into mild, moderate, or severe relies on the actual valve area value. Typical thresholds are roughly mild >1.5 cm², moderate 1.0–1.5 cm², and severe <1.0 cm². Other Doppler measurements like E velocity or deceleration time reflect filling dynamics and loading conditions and can support the assessment, but they are not the primary criteria used to define MS severity.