The Canadian journal of cardiology
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Cardiac resynchronization therapy (CRT) is an established treatment of severe systolic heart failure with intraventricular conduction delay. The influence on mortality of the left ventricular (LV) pacing site and the type of bundle-branch block during CRT is unclear. ⋯ LV lead position and nonspecific conduction delay are predictors of mortality in patients during cardiac resynchronization therapy.