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• W3046929978 abstract "Abstract Background Radiofrequency (RF) power is routinely considered during RF application. In contrast, impedance has been relatively poorly studied, despite also influencing RF lesion creation. The aim of this study was to examine the influence of electric impedance on RF lesion characteristics and on clinical RF ablation parameters. Methods and Results In the first part of the study, power and impedance were systematically varied and the resulting current was calculated using custom‐made software. In the second part of the study, ablation lesions ( n = 40) were analyzed in a porcine ex vivo model. RF applications were delivered in cardiac muscle preparations with systematically varied values of electric impedance using a contact force ablation catheter. In the third part of the study, n = 3378 clinical RF applications were analyzed, power, impedance, and current data were exported and correlated with clinical patient data. 20 ± 3 W/80 Ω, 30 ± 3 W/120 Ω, 40 ± 3 W/160 Ω, and 50 ± 3 W/200 Ω RF applications resulted in 498 ± 40, 499 ± 26, 500 ± 20, and 500 ± 16 mA RF current, which were not significantly different ( p = .32). Ablation lesions were significantly different in depth and diameter when applied with the same power but different impedances ( p < .01); lesion sizes decreased when increasing impedance. In clinical data, a large range of delivered current (e.g., 39–40 W: 530–754 mA) was measured, due to variations in impedance. Conclusions RF lesion creation is determined by current rather than by power. During clinical RF ablation procedures, impedance significantly influences current delivery and varies considerably between patients. Impedance and current are clinically relevant parameters that should be considered during RF ablation." @default.
• W3046929978 created "2020-08-10" @default.
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• W3046929978 date "2020-08-13" @default.
• W3046929978 modified "2023-10-16" @default.
• W3046929978 title "Impedance, power, and current in radiofrequency ablation: Insights from technical, ex vivo, and clinical studies" @default.
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• W3046929978 doi "https://doi.org/10.1111/jce.14709" @default.
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