[Double ventricular response to a single atrial stimulation caused by simultaneous anterograde conduction through two atrioventricular nodal pathways].
In a patient with atrioventricular nodal reentrant tachycardia, during programmed stimulation, an atrial extrastimulus induced a double ventricular response due to a single atrial depolarization, with simultaneous and delayed anterograde conduction through fast and slow pathways, and induced the tachycardia. Pacing-induced type I block involving both pathways put these pathways out of phase, so that the distal conduction system and the ventricle responded to both the fast and slow pathways anterograde impulses.
Vitale
P
P
Cattedra di Cardiologia, Seconda Università degli Studi, Napoli.
Santangelo
L
L
Mayer
M S
MS
Nave
C
C
Curcio
N
N
Iacono
A
A
D001283:Atrioventricular Node / Q000503:physiopathology; D004558:Electric Stimulation; D006325:Heart Atria / Q000503:physiopathology; D006352:Heart Ventricles / Q000503:physiopathology; D006801:Humans; D008297:Male; D008875:Middle Aged; D013611:Tachycardia, Atrioventricular Nodal Reentry / Q000503:physiopathology*
Duplice risposta ventricolare ad un singolo stimolo atriale dovuta a conduzione anterograda simultanea in due vie del nodo A-V.