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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|---|---|
| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC484671 | PMC |
| http://dx.doi.org/10.1136/hrt.77.2.180 | DOI Listing |
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