Jiang Yuan, Farina Dima, Bar-Tal Meir, Dössel Olaf
Institute of Biomedical Engineering, Karlsruhe Institute of Technology, Karlsruhe, Germany.
IEEE Trans Biomed Eng. 2009 Aug;56(8):1963-70. doi: 10.1109/TBME.2009.2021659. Epub 2009 May 12.
Over the last years, nonfluoroscopic in vivo cardiac mapping and navigation systems have been developed and successfully applied in clinical electrophysiology. Clearly, a trend can be observed to introduce more sensors into the measurement system so that physiological information can be gathered simultaneously and more efficiently and the duration of procedure can be shortened significantly. However, it would not be realistic to equip each catheter electrode with a localizer, e.g., by embedding a miniature magnetic location sensor. Therefore, in this paper, an alternate approach has been worked out to efficiently localize multiple catheter electrodes by considering the impedance between electrodes in the heart and electrode patches on the body surface. In application of the new technique, no additional expensive and sophisticated hardware is required other than the currently existing cardiac navigation system. A tank model and a computerized realistic human model are employed to support the development of the positioning system. In the simulation study, the new approach achieves an average localization error of less than 1 mm, which proves the feasibility of the impedance-based catheter positioning system. Consequently, the new positioning system can provide an inexpensive and accurate solution to improve the efficiency and efficacy of catheter ablation.
在过去几年中，非荧光透视体内心脏标测与导航系统已被开发并成功应用于临床电生理学。显然，可以观察到一种趋势，即在测量系统中引入更多传感器，以便能够同时更高效地收集生理信息，并显著缩短手术时间。然而，为每个导管电极配备定位器（例如通过嵌入微型磁性定位传感器）是不现实的。因此，在本文中，已经研究出一种替代方法，通过考虑心脏内电极与体表电极贴片之间的阻抗来有效地定位多个导管电极。在新技术的应用中，除了现有的心脏导航系统外，不需要额外昂贵且复杂的硬件。采用水箱模型和计算机化真实人体模型来支持定位系统的开发。在模拟研究中，新方法实现了平均定位误差小于1毫米，这证明了基于阻抗的导管定位系统的可行性。因此，新的定位系统可以提供一种廉价且准确的解决方案，以提高导管消融的效率和效果。
