Which method is preferred for the assessment of the mitral valve area (MVA)?

• A. Planimetry
• B. PHT-based method
• C. Gorlin formula
• D. Three-dimensional planimetry

Answer: (A)

Direct planimetry of the mitral valve orifice on a parasternal short-axis view during diastole provides the actual anatomical area, making it the most direct and reliable way to gauge MVA. It avoids the hemodynamic assumptions that underpin other methods. The PHT-based approach relies on diastolic filling time and can be distorted by heart rate, rhythm, loading conditions, or prosthetic valves, leading to inaccurate results. The Gorlin formula requires invasive catheterization and precise stroke volume estimates, introducing more potential for error. Although 3D planimetry can offer improved accuracy when high-quality 3D images are available, the standard, most widely used method remains planimetry, with 3D planimetry as a refinement in appropriate cases.