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首页> 外文期刊>PACE: Pacing and clinical electrophysiology >Comparison of pulsed versus continuous radiofrequency energy delivery: diameter of lesions induced with multipolar ablation catheter.
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Comparison of pulsed versus continuous radiofrequency energy delivery: diameter of lesions induced with multipolar ablation catheter.

机译:脉冲与连续射频能量输送的比较:多极消融导管诱发的病变直径。

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摘要

The aim of this study was to compare the efficacy of pulsed versus continuous RF energy delivery via multipolar ablation catheters. In vitro tests were performed in endomyocardial preparations of fresh bovine hearts in a both of physiological saline solution (37 degrees C) at constant flow conditions (1.5 L/min). The catheters were applied to the endocardium at a constant pressure. Energy was delivered pulsed (to 4 electrodes simultaneously, 5-ms duty cycle) or continuously (to each electrode separately). In vivo experiments were performed under fluoroscopy in eight anesthetized pigs, guided by endocardial electrograms to place the catheters in 22 different intraatrial positions. Lesion volume was calculated from measurements of the lesion diameter with a microcaliper. The homogeneity of the lesions was classified from 1 (highest) to 4 (least). More homogeneous linear lesions were produced in significantly less time with pulsed than with continuous energy delivery. There were no differences in electrode temperature or impedance values in vitro and in vivo. The results in the in vitro experiments were reproducible in the intact animal experiments. Significantly larger and more homogeneous linear lesions were created more rapidly with pulsed than with continuous energy delivery.
机译:这项研究的目的是比较通过多极消融导管进行脉冲和连续射频能量输送的功效。在恒定流量条件下(1.5 L / min),在两种生理盐水溶液(37摄氏度)中,对新鲜牛心的心内膜制剂进行体外测试。将导管以恒定压力施加至心内膜。能量以脉冲方式(同时发送至4个电极,占空比为5毫秒)或连续(分别发送至每个电极)。在八只麻醉猪的荧光镜下进行体内实验,在心内膜电描记图的引导下,将导管放置在22个不同的心房内位置。使用微量测径仪通过对病变直径的测量来计算病变体积。病变的均匀性从1(最高)到4(最低)分类。与连续能量递送相比,脉冲产生的时间更短,均匀性更高。体外和体内电极温度或阻抗值均无差异。体外实验的结果在完整的动物实验中是可重现的。与连续能量递送相比,脉冲产生的更大,更均匀的线性病变更快。

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