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Figure 1 Strain Plots Comparing Mechanical Dyssynchrony in Failing Hearts With RBBB and LBBB

Temporal strain maps for (A) left bundle branch block (LBBB) + heart failure; (B) right bundle branch block (RBBB) + heart failure during right atrial pacing; (C) corresponding LBBB + heart failure strain plot; and (D) corresponding RBBB + heart failure strain plot during early and late systole.