The demonstration of tachycardia entrainment with concealed fusion in response to
continuous overdrive atrial pacing (OAP) during atrial macro-reentry is helpful to
identify an isthmus of “protected” conduction (i.e., that bounded by fixed or functional
lines of conduction block) within the reentry circuit and to guide the radiofrequency
current delivery during catheter ablation procedures.
1
,
2
,
3
However, entrainment mapping may result in inadvertent termination of the tachycardia
or transformation into nonclinical arrhythmias by overdrive stimulation. Therefore,
its extensive application during catheter ablation procedures is sometimes discouraged,
4
,
5
,
6
and alternative pacing techniques may be requested. In the present report, we have
prospectively evaluated the feasibility and usefulness of single premature atrial
beat (SPAB) stimulation compared with standard OAP in identifying the isthmus of protected
conduction during different macro-reentrant atrial tachycardias.- Nakagawa H.
- Shah N.
- Matsudaira K.
- Overholt E.
- Chandrasekaran K.
- Beckman K.J.
- Spector P.
- Calame J.D.
- Rao A.
- Hasdemir C.
- et al.
Characterization of reentrant circuits in macroreentrant right atrial tachycardia
after surgical repair of congenital heart disease. Isolated channels between scars
allow “focal” ablation.
Circulation. 2001; 103: 699-709
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References
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Article Info
Publication History
Accepted:
March 3,
2003
Received in revised form:
March 3,
2003
Received:
November 13,
2002
Identification
Copyright
© 2003 Excerpta Medica Inc. Published by Elsevier Inc. All rights reserved.
