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New endpoint for ablation of ventricular tachycardia: change in QRS morphology with pacing at protected isthmus as index of isthmus block.

Abstract：

INTRODUCTION:Endpoints confirming block in the critical isthmus in sinus rhythm and with pace mapping have not been established. METHODS AND RESULTS:A 44-year-old man with a history of Tetralogy of Fallot presented with recurrent ventricular tachycardia (VT). Entrainment mapping was consistent with a macroreentrant circuit rotating in a clockwise fashion under the pulmonic valve. After termination of the VT in a critical isthmus located on the conal free wall, a pace map proximal to the site of successful ablation was consistent with a change in QRS morphology. This change in QRS morphology suggested critical isthmus block and successful ablation, which was confirmed by noninducibility with programmed stimulation. CONCLUSION:Evidence of conduction block can be used as an additional endpoint for successful ablation of VT.

journal_name

J Cardiovasc Electrophysiol

journal_title

Journal of cardiovascular electrophysiology

authors

Bala R,Dhruvakumar S,Latif SA,Marchlinski FE

doi

10.1111/j.1540-8167.2009.01596.x

subject

Has Abstract

pub_date

2010-03-01 00:00:00

pages

320-4

issue

3

eissn

1045-3873

issn

1540-8167

pii

JCE1596

journal_volume

21

pub_type

杂志文章

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