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Comparison of the nonplanarity (NP) angle and the annular height commissural width ratio methods of assessment of the saddle shape of the mitral annulus. A: (AHMax = annular height maximum; AHMin = annular height minimum; Ant. = anterior annulus; MA plane = mitral annular plane of least square fit; Post. = posterior.) B: Assessment of mitral annular saddle shape by the nonplanarity angle.
