Department of Cardiology, University Hospital Maggiore della Carità, Novara, Italy.
Europace. 2012 Jul;14(7):1054-9. doi: 10.1093/eupace/eur417. Epub 2012 Jan 25.
To characterize the electromagnetic field emitted by the electromagnetic navigational bronchoscopy (ENB) superDimension(®) Bronchus system (SDBS) and to determine whether current implantable cardioverter defibrillator (ICD) systems are suitable for use in conjunction with SDBS.
The electromagnetic emission of the SDBS location board were measured using a field strength meter connected to a low-frequency (5 Hz-100 kHz) electric and magnetic field analyser; the static magnetic field was measured using a three-axis Tesla meter. A human torso simulator was used in the in vitro experiment: a polyethylene plastic box (61 cm length × 43 cm depth × 16.5 cm height) was filled with a semisolid gel and a 0.45% saline solution to provide electric conductance similar to tissue. The ICDs were immersed 1 cm into the gel and connected with a dual-coil integrated bipolar pacing/sensing/shock lead. Tip and right ventricular coil of the lead were connected to an arrhythmia simulator using low-impedance cables. The system transmits electromagnetic waves of 2.5, 3.0, and 3.5 kHz frequency. The maximum magnetic fields measured were B = 53 and 12 µT at location board plane and at ICD plane, respectively. Corresponding figures for the electric field were E = 16.6 and 4.4 V/m. None of the tested ICDs recorded any noise signal during the period in which the location board was switched-on. Stored electrogram analysis confirmed the correct detection of simulated tachyarrhythmia and therapy delivery by every tested ICD.
The results of this study demonstrated that tested ICDs are compatible with ENB performed with SDBS. They also suggest that these results may be extended to all ICDs manufactured in compliance with current EN regulations.
描述电磁导航支气管镜（ENB）超维度（®）支气管系统（SDBS）发射的电磁场，并确定当前植入式心脏复律除颤器（ICD）系统是否适合与 SDBS 联合使用。
使用连接到低频（5 Hz-100 kHz）电场和磁场分析仪的场强计测量 SDBS 定位板的电磁发射；使用三轴特斯拉计测量静态磁场。在体外实验中使用人体躯干模拟器：一个聚乙烯塑料盒（61 cm 长×43 cm 深×16.5 cm 高）充满半固态凝胶和 0.45%生理盐水，以提供类似于组织的电导率。将 ICD 浸入凝胶中 1 cm 处，并与双线圈集成双极起搏/感测/电击引线连接。引线的尖端和右心室线圈通过低阻抗电缆与心律失常模拟器连接。该系统发射 2.5、3.0 和 3.5 kHz 频率的电磁波。在定位板平面和 ICD 平面处测量到的最大磁场分别为 B = 53 和 12 µT。相应的电场值分别为 E = 16.6 和 4.4 V/m。在定位板开启期间，没有一台测试的 ICD 记录到任何噪声信号。存储的电图分析证实，所有测试的 ICD 都能正确检测到模拟的心动过速和治疗传递。
这项研究的结果表明，测试的 ICD 与使用 SDBS 进行的 ENB 兼容。它们还表明，这些结果可能适用于符合当前 EN 规定制造的所有 ICD。
