Supra-his alternate-beat Wenckebach dysrhythmia.
Alternate-beat Wenckebach, an uncommon dysrhythmia, usually is attributed to block within the His bundle or bundle branches (or in both). A patient with features of the "sick sinus" syndrome demonstrated A-V nodal (supra-His) alternate-beat Wenckebach during atrial pacing and His bundle electrocardiography. Electrophysiologic mechanisms are proposed.
D001145:Arrhythmias, Cardiac / Q000209:etiology*; D001282:Atrial Flutter / Q000503:physiopathology; D001919:Bradycardia / Q000503:physiopathology; D002036:Bundle of His / Q000503:physiopathology; D004562:Electrocardiography; D006327:Heart Block / Q000150:complications / Q000503:physiopathology; D006801:Humans; D008297:Male; D008875:Middle Aged