Lesion outline and thermal field distribution of ablative in vitro experiments in myocardia: comparison of radiofrequenc
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RESEARCH ARTICLE
Open Access
Lesion outline and thermal field distribution of ablative in vitro experiments in myocardia: comparison of radiofrequency and laser ablation Wei Li1†, Jia Liu1†, Tong‑yi Huang2, Xian Zhong2, Dao‑peng Yang2, Xiao‑hua Xie2, Dong‑hong Liu1, Xiao‑yan Xie2 and Bo‑wen Zhuang2*
Abstract Objectives: To explore the lesion outline and thermal field distribution of radiofrequency ablation (RFA) and laser ablation (LA) in myocardial ablation in vitro. Materials and methods: Twenty-four fresh porcine hearts were ablated with RFA or LA in vitro. The radiofrequency electrode or laser fiber and two parallel thermocouple probes were inserted into the myocardium under ultra‑ sound guidance. The output power for RFA was 20 W/s and for LA was 5 W/s, and the total thermal energies were 1200 J, 2400 J, 3600 J, and 4800 J. The range of ablation lesions was measured, and temperature data were recorded simultaneously. Results: All coagulation zones were ellipsoidal with clear boundaries. The center of LA was carbonized more obvi‑ ously than that of RFA. With the accumulation of thermal energy and the extended time, all the ablation lesions induced by both RFA and LA were enlarged. By comparing the increase in thermal energy between the two groups, both the short-axis diameter and the volume change showed significant differences between the 1200 J and 3600 J groups and between the 2400 J and 4800 J groups (all P
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