Population
16 cases with intermittent bundle-branch block showing rate-dependence
Design
Case_series
Authors
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Hypothesis-generating for rate-dependent bundle-branch block mechanisms; prospective validation needed before clinical adoption.
The study differentiates the mechanisms of rate-dependent bundle-branch blocks, attributing tachycardia-dependent block to cycle length-recovery time relations and bradycardia-dependent block to enhanced phase-4 depolarization.
Nabil El‐Sherif (1972) studied this question.