Stepwise transition of 2:1 atrio-ventricular block to 1:1 conduction induced by ventricular premature beats in a patient with atypical AVNRT.
A 55-year-old man with a 2-year history of recurrent paroxysmal palpitations and with an electrocardiogram documentation of atypical atrioventricular nodal re-entrant tachycardia (AVNRT) was referred to us for catheter ablation. After an initial ablation attempt, several episodes of atypical AVNRT were induced. During one of these episodes, we documented a stepwise transition of 2:1 atrioventricular block to 1:1 conduction, following two single ventricular premature beats. This phenomenon confirmed the functional nature of the AV block during AVNRT and indirectly its infra-nodal location.
Sorgente
Antonio
A
Heart Rhythm Management Center, UZ Brussel-VUB, Laarbeeklan 101, Brussels, Belgium. sorgente.antonio@gmail.com
Chierchia
Gian Battista
GB
De Asmundis
Carlo
C
Yazaki
Yoshinao
Y
Sarkozy
Andrea
A
Brugada
Pedro
P
D054537:Atrioventricular Block / Q000601:surgery*; D017115:Catheter Ablation; D006329:Heart Conduction System / Q000503:physiopathology / Q000601:surgery; D006801:Humans; D008297:Male; D008875:Middle Aged; D013611:Tachycardia, Atrioventricular Nodal Reentry / Q000601:surgery*; D016896:Treatment Outcome; D018879:Ventricular Premature Complexes / Q000601:surgery*