Which view is used for planimetry in MS?

Which view is used for planimetry in MS?

• A. PSAX
• B. AP4-chamber view
• C. Subcostal long-axis view
• D. AP2-chamber view

Answer: (A)

Planimetry measures the mitral valve area by tracing the actual opening of the valve in diastole. The best view to do this is the parasternal short-axis view taken at the level of the mitral valve, because it provides a true cross-sectional plane of the open mitral orifice with minimal foreshortening. In this view the mitral leaflets open fully in diastole and outline the orifice clearly, allowing an accurate trace of its area. Other views, like apical 4- or 2-chamber, can be off-plane or have distorted contour due to oblique projection, and subcostal long-axis doesn’t give the ideal short-axis cross-section needed for planimetry.

Planimetry measures the mitral valve area by tracing the actual opening of the valve in diastole. The best view to do this is the parasternal short-axis view taken at the level of the mitral valve, because it provides a true cross-sectional plane of the open mitral orifice with minimal foreshortening. In this view the mitral leaflets open fully in diastole and outline the orifice clearly, allowing an accurate trace of its area. Other views, like apical 4- or 2-chamber, can be off-plane or have distorted contour due to oblique projection, and subcostal long-axis doesn’t give the ideal short-axis cross-section needed for planimetry.