Figure 2

D2 is the length of artificial chordae to be implanted. In the 3D zoom view that includes the mitral valve leaflet,chordae tendineae and papillary muscle at the systolic phase. The X-plane and Y-plane were changed to show the relationship between the prolapsed segment and papillary muscle in the Z-plane using mitral valve quantification software. The distance (D2) from the tip of the papillary muscle to the normal closing point of the leaflet segment was regarded as the reference length of artificial chordae.