Role of dyssynchrony in optimization of CRT implantation: a time to re-think?

The authors discuss the difficult areas for cardiac resynchronization therapy, optimization of the treatment for implanting the left ventricular (LV) lead and the factors that affected the efficacy of LV. They mention about the study by Kristiansen and colleagues that described the role of employing 2-dimensional speckle tracking technology in assessing LV segmental function in heart failure patients. They state the methods to measure the anteroposterior wall delay in LV mid-cavity level.