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Abstract
Cardiac resynchronization therapy (CRT) proved to improve mechanical dyssynchrony in chronic heart failure. Gated SPECT phase analysis offer objective analysis of mechanical dyssynchrony. Also scar burden assessment plays an important role in predicting response to CRT implantation, which could be performed by gated SPECT and cardiac magnetic resonance (CMR) Assessment of gated SPECT LV phase analysis before and after CRT implantation with the potential role of LV phase analysis Gated SPECT to predict CRT outcome. Quantification of LV scar burden by gated SPECT versus CMR, and its role in predicting CRT outcome. Thirty patients underwent CRT implantation. Pre - implantation delayed hyperenhancement cardiac magnetic resonance was done to document scar burden and lateral wall involvement on a standard 17 - segment model. Also 99mTc - MIBI gated SPECT and echocardiographic examination were done pre - implantation and 6 months after CRT implantation to assess LV volumes, and LVEF