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Mechanisms of the two different features of leaflet tenting in FMR according to Kwan et al. (39) and Agricola et al. (40). Asymmetrical posterior tethering is the result of both posterior wall dysfunction and posterior annular dilatation. Symmetrical tethering is the result of predominant apical tethering of both leaflets due to global LV and annular dilation. FMR, functional mitral regurgitation; LV, left ventricular.
