期刊
IEEE TRANSACTIONS ON BIOMEDICAL ENGINEERING
卷 49, 期 3, 页码 247-253出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/10.983459
关键词
ablation; biomedical electrodes; biomedical measurements; cardiovascular system; conductivity measurement; electrodes; impedance measurement; measurement
资金
- NATIONAL HEART, LUNG, AND BLOOD INSTITUTE [R01HL056143] Funding Source: NIH RePORTER
- NHLBI NIH HHS [HL 56143] Funding Source: Medline
During radio-frequency (RF) cardiac catheter ablation, there is little information to estimate the contact between the catheter tip electrode and endocardium because only the metal electrode shows up under fluoroscopy. We present a method that utilizes the electrical impedance between the catheter electrode and the dispersive electrode to predict the catheter tip electrode insertion depth into the endocardium. Since the resistivity of blood differs front the resistivity of the endocardium, the impedance increases as the catheter tip lodges deeper in the endocardium. In vitro measurements yielded the impedance-depth relations at 1, 10, 100, and 500 kHz. We predict the depth by spline curve interpolation using the obtained calibration curve. This impedance method gives reasonably accurate predicted depth. We also evaluated alternative methods, such as impedance difference and impedance ratio.
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