Three transmural columns of four bead sets each are implanted across the lateral wall. We define a local Cartesian coordinate system {ec, el, er} aligned with the local circumferential C, longitudinal L, and radial R directions. The radial axis er is oriented normal to the plane spanned by the three epicardial beads. The circumferential axis ec wraps around the heart with a mathematically positive orientation, normal to the vector connecting the apex of the heart with the origin of the coordinate system, and normal to the radial axis er. The longitudinal axis el = er × ec points from apex to base, normal to the radial and circumferential axes.