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Abstract
Biventricular pacing (BiV) to effect cardiac resynchronization therapy can be technically
difficult and fails to elicit a clinical response in 30% to 40% of patients. Direct
His-bundle pacing (DHBP) theoretically could obviate some of these problems. Although
DHBP is capable of narrowing the QRS in some patients, the consistency with which
this can be achieved has not been characterized.