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Figure 1 (A) A series of tissue Doppler imaging (TDI) echocardiograms in a patient with primitive dilated cardiomyopathy with complete left bundle branch block (QRS width of 150 ms) and left ventricular ejection fraction of 21%. Despite a long QRS duration (B), this patient presents with no intra-left ventricular electromechanical asynchrony, because the anterior (A), inferior (I), septal (S), and lateral (L) electromechanical delays (between the onset of the QRS and that of the S wave observed on the TDI echocardiogram) are within a range of 30 ms. Respective electromechanical delay (EMD) of one given LV wall, between the onset of the QRS complex and that of the S wave observed on the TDI echocardiogram.