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Legend. 3-D non-contact mapping in a DCM patient (QRS >150 ms) who responded to CRT, shows propagation wavefront split when encountering a conduction block located at the LV anterior wall, resulting in delayed activation of the lateral wall (top row). Tagged MRI-based spatial and temporal evolution of 3-D circumferential strain (middle and bottom rows) from end-diastolic (left) to end-systolic (right) phases in normal (middle row) and LBBB (bottom row) heart; blue corresponds to shortening, yellow to stretch and red is neutral. See pages 2170 and 2224.