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Figure 2 (A) Color-coded tissue Doppler recordings in a heart failure patient with narrow QRS complex (96 ms), demonstrating a delay in peak systolic velocities of 85 ms (arrows indicate peak systolic velocity). (B) Color-coded tissue Doppler recordings in a patient with wide QRS complex (170 ms) illustrating a delay of 140 ms. The tissue Doppler tracings are obtained from samples placed in the basal part of the septum (yellow curve) and the lateral wall (green curve).
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