Key result
Atrial extrasystolic bigeminy can manifest as alternating RBBB and LBBB aberration via cycle-dependent refractory variations.
Alternating right and left bundle branch block aberration in atrial extrasystolic bigeminy can be explained by cycle-dependent variations of the bundle branch refractory period.
Consider cycle-dependent refractoriness in alternating aberrancy during atrial bigeminy; case report leaves open broader validation.
We report two cases of atrial extrasystolic bigeminy manifesting with alternating right and left bundle branch block aberration. The manifestation is explained on the basis of cycle-dependent variations of the bundle branch refractory period with alternate resetting of bundle branch refractoriness.
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Oreto et al. (1986) studied this question. Atrial extrasystolic bigeminy can manifest with alternating right and left bundle branch block aberration caused by cycle-dependent variations of the bundle branch refractory period.
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