What does this research mean for the field?

In a patient with congenital heart disease and bilateral bundle branch block, gradual transitions between sinus rhythm and isorhythmic A-V dissociation suggest the occurrence of parasystolic fusion of upper and lower pacemakers. Novelty: ClaimNovelty.INCREMENTAL. Consensus alignment: ConsensusAlignment.NEUTRAL.

January 1, 1972Open Access

A Case of Congenital Heart Disease With Bilateral Bundle Branch Block Showing Intermittent a-v Dissociation With Parasystolic Property

KNKimiaki NakamotoNihon University

Structured PICO

Population

A 15-year-old boy with congenital heart disease showing bilateral bundle branch block and intermittent A-V dissociation (n=1).

Outcome

Electrocardiographic findings including QRS morphology and axis during different rhythms.

This case highlights the possibility of parasystolic fusion of upper and lower pacemakers during transitions between sinus rhythm and isorhythmic A-V dissociation in a patient with congenital heart disease.

Abstract

A 15-year-old boy with congenital heart disease showed two types of wide QRS complexes in the limb leads. One type appeared during sinus rhythm with a QRS axis of ca. -45°, and the other during isorhythmic A-V dissociation with a QRS axis of ca. +110°. Transitions between the two rhythms were gradual, and several intermediate QRS complexes intervened. Possibility of parasystolic fusion of upper and lower pacemakers during transitions was discussed.

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Cite This Study

Kimiaki Nakamoto (Sat,) studied this question.

synapsesocial.com/papers/6a1c07e04ebd09f3dfa95bbc https://doi.org/https://doi.org/10.1253/jcj.36.55

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