The Effect of Dispersive Electrode Position on Radiofrequency Ablation Lesion Formation

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  • アブレーション焼灼病変形成における対極板貼付位置の影響：対外モデルを用いた検討

Abstract

<p>【Purpose】Radiofrequency catheter ablation can obtain a therapeutic effect by performing radiofrequency energization between the dispersive electrode attached to the body surface and the ablation catheter in contact with the myocardium. However, there are few reports about the effect of dispersive electrode position on radiofrequency ablation lesion size. We investigated the effect of the attachment position of the dispersive electrode on the ablation lesion formation using an in vitro model.【Methods】Using a 7F open-tip irrigated catheter with a contact force sensor, radiofrequency applications were delivered to beef slabs by two protocols of dispersive electrode position in an in vitro model（8 lesions for each protocol, 20 seconds, power of 50W, contact force of 10g）. The first position of the dispersive electrode was arranged in the forward direction of the catheter tip. The other position was in the opposite direction of the catheter tip. The interrelation between lesion formation and dispersive electrode position was evaluated.【Results】Lesions with the dispersive electrode arranged in the forward direction of catheter tip were significantly deeper than opposite direction（4.3±0.5mm vs 2.9±0.4mm, p=0.01）. Lesion width（5.9±0.8mm vs 5.6±0.7mm）and impedance drop（20±11mm vs 19±9.3mm）were not significantly different between each patch position.【Conclusion】The position of the dispersive electrode may affect ablation lesion size, especially depth.</p>

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