Key result
An initial discrete radiofrequency application at a very narrow preexisting isthmus between the tricuspid annulus and anterior line of double potentials completed the IVC-TA isthmus conduction block.
Case Report (n=1)
A single discrete radiofrequency application at a very narrow preexisting isthmus successfully achieved IVC-TA isthmus conduction block in a patient with typical atrial flutter.
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May allow single-lesion block at narrow preexisting isthmuses in typical flutter; hypothesis-generating from one case report and should not change practice.
A 61-year-old woman with typical atrial flutter underwent an electrophysiologic study and radiofrequency catheter ablation. The electroanatomic mapping revealed two contiguous lines of distinct double potentials (DPs) extending anteriorly/posteriorly from the coronary sinus ostium to the inferior vena cava (IVC) border. A large part of the anterior line of the DPs was close and parallel to the tricuspid annulus (TA). An initial discrete radiofrequency application at the very narrow preexisting isthmus between the TA and anterior line of the DPs completed the IVC-TA isthmus conduction block.
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Yamada et al. (2007) conducted a case report in typical atrial flutter (n=1). radiofrequency catheter ablation was evaluated on IVC-TA isthmus conduction block. An initial discrete radiofrequency application at a very narrow preexisting isthmus between the tricuspid annulus and anterior line of double potentials completed the IVC-TA isthmus conduction block.
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