Affiliation:
1. From the Department of Cardiology, Chang Gung University, and Chang Gung Memorial Hospital–Linkou, Taiwan.
Abstract
Background
—Characterization of typical atrioventricular nodal reentrant tachycardia (AVNRT) with continuous AVN conduction (A
1
A
2
/A
2
H
2
) curves by double atrial extrastimulation (A
1
A
2
A
3
) has never been systematically studied.
Methods and Results
—This study was composed of 33 patients with typical AVNRT and continuous AVN conduction curves (group 1) and 103 patients with AVNRT and discontinuous AVN conduction curves (group 2). Using A
1
A
2
A
3
with predefined fast pathway–conducted A
2
, we examined the effects of slow pathway ablation on the A
2
A
3
/A
3
H
3
curves in both groups. In group 1, anterograde AVN effective refractory period (272±33 versus 277±47 ms,
P
>0.05) and AVN Wenckebach block cycle length (320±45 versus 343±59 ms,
P
>0.05) remained unchanged after ablation. A
2
H
2
max was shorter in group 1 than group 2 (237±89 versus 395±72 ms,
P
<0.05) at baseline. It shortened in group 2 (395±72 versus 221±78 ms,
P
<0.001) but remained unchanged in group 1 (237±89 versus 214±59 ms,
P
>0.05) after ablation. A
1
A
2
A
3
could further disclose discontinuous A
2
A
3
/A
3
H
3
curves in 29 patients of group 1. A
3
H
3
max shortened in both groups (375±81 versus 238±82 ms,
P
<0.001, and 419±104 versus 220±78 ms,
P
<0.001, respectively) in a similar fashion. Successful ablation resulted in loss of the left portion of the A
2
A
3
/A
3
H
3
curves in the 4 patients of group 1 with continuous A
2
A
3
/A
3
H
3
curves.
Conclusions
—Use of A
1
A
2
A
3
could expose discontinuous A
2
A
3
/A
3
H
3
curves in most patients with continuous A
1
A
2
/A
2
H
2
curves. Significant shortening of A
3
H
3
max after ablation may be indicative of successful elimination of AVNRT.
Publisher
Ovid Technologies (Wolters Kluwer Health)
Subject
Physiology (medical),Cardiology and Cardiovascular Medicine
Cited by
25 articles.
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