Abstract
Elizari, Lazzari and Rosenbaum 673 remind us that intermittent bundle branch block (BBB) may be rate-related and tends to occur both at rapid and slow rates, with normal conduction at intermediate rates. Tachycardia (dependent BBB is believed to be related to a prolongation of recovery and has been termed “phase 3 block” and bradycardia) dependent BBB is thought to be related to hypopolarization plus spontaneous diastolic depolarization (SDD) and has been termed “phase 4 block.”
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