Mechanism of QRS electrical alternans.
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.
Brembilla-Perrot
B
B
Cardiology A, University Hospital of Brabois, Vandoeuvre, France.
Lucron
H
H
Schwalm
F
F
Haouzi
A
A
D002304:Cardiac Pacing, Artificial; D004562:Electrocardiography; D006327:Heart Block / Q000503:physiopathology*; D006801:Humans; D008875:Middle Aged