The value of left ventricular strain–volume loops in predicting response to cardiac resynchronization therapy

Three-dimensional speckle-tracking imaging of individual examples from a CRT responder and a non-reponder before CRT and 6-month follow-up after CRT. (a) A CRT responder before CRT; (b) A CRT responder at 6-month follow-up after CRT; (c) A CRT non-responder before CRT; (d) A CRT non-responder at 6-month follow-up after CRT. The image upper right is 16 segmental strain-time curves and lower right is 16 segmental volume-time curve