Abstract
In patients with heart failure, mortality is increased in the presence of left ventricular (LV) conduction delays generated by left bundle branch block (LBBB),1 but overall survival improved when these are corrected by pre-excitation of the LV by cardiac resynchronization therapy (CRT).2 Posterolateral LV conduction delays imposed by right ventricular pacing, which reproduces the surface electrocardiograph (ECG) pattern of LBBB, are augmented by coexisting LV dysfunction and associated with increased mortality.
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