Key result
A reported case confirms the hypothesis that QRS electrical alternans is secondary to a 2:1 block in the activation of some part of the ventricles related to retrograde conduction.
Why the study?
What is the mechanism of QRS electrical alternans during ventricular pacing in patients with latent dual AV nodal pathways?
Case Report (n=1)
What is the mechanism of QRS electrical alternans during ventricular pacing in patients with latent dual AV nodal pathways?
This case report provides evidence that QRS electrical alternans during ventricular pacing is caused by a 2:1 block in the activation of a portion of the ventricles.
Answers are grounded in this paper and cite their sources.
Supports 2:1 ventricular block mechanism for QRS alternans in one paced case; leaves open validation in dual AV nodal pathways.
In patients with latent dual atrioventricular nodal pathways a 2:1 ventriculoatrial block often occurs during ventricular pacing and is generally associated with the concomitant appearance of QRS alternans. This type of QRS alternans is related to retrograde conduction, and a concealed retrograde conduction in the His Purkinje system could explain the QRS alternans. A case that confirms the hypothesis that electrical alternans is secondary to a 2:1 block in the activation of some part of the ventricles is reported.
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Brembilla-Perrot et al. (1997) conducted a case report in QRS electrical alternans (n=1). Ventricular pacing was evaluated on Mechanism of QRS alternans. A reported case confirms the hypothesis that QRS electrical alternans is secondary to a 2:1 block in the activation of some part of the ventricles related to retrograde conduction.
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