[Tachycardias caused by double ventricular responses and unusual atrioventrio-ventricular relations in linear dissociation of the AV node].
Noninvasive recordings in a 69-year-old woman showed phasic shifts between two distinct PR intervals of about 0.21 and 0.58 s suggestive of dual AV nodal conduction in the presence of two intranodal pathways. Episodes of tachycardia exhibited a one to two relationship between P waves and QRS complexes, with the same short and long PR intervals interpreted as simultaneous anterograde fast and slow conduction via the two AV nodal pathways, leading to a double ventricular response to single P waves. Various mechanisms of transition from short to long or long to short conduction times and concealed conduction phenomena could be demonstrated supporting the concept of two functionally separated intranodal pathways.
Buss
J
J
Stegaru
B
B
Kraatz
J
J
Keller
H
H
Neuss
H
H
Heene
D L
DL
D000368:Aged; D001283:Atrioventricular Node / Q000503:physiopathology*; D005117:Cardiac Complexes, Premature / Q000503:physiopathology; D002304:Cardiac Pacing, Artificial; D004562:Electrocardiography; D005260:Female; D006325:Heart Atria / Q000503:physiopathology*; D006327:Heart Block / Q000503:physiopathology; D006329:Heart Conduction System / Q000503:physiopathology*; D006339:Heart Rate; D006352:Heart Ventricles / Q000503:physiopathology*; D006801:Humans; D013610:Tachycardia / Q000503:physiopathology*
Tachykardien durch doppelte Kammerantworten und ungewöhnliche Vorhof-Kammer-Beziehungen bei Längsdissoziation des AV-Knotens.