Abstract
Cardiac resynchronization therapy (CRT) has been shown to improve symptoms and mortality in a suitably selected population with systolic heart failure and prolonged QRS duration. Various factors have been reported to be associated with poor response to CRT. A 67-year-old man with CRT implantation experienced response, nonresponse, and response in turn. The new-onset right tachycardia-dependent bundle branch block was considered to be an exclusive cause. More attention should be paid to the possible changes of paced-QRS morphology, resulting from tachycardia-dependent aberrancy during CRT, ensuring a high percentage of effective biventricular pacing.
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