Detailed analysis of the lesion formation using a diamond tip catheter in an ex vivo experimental model

烧蚀 病变 导管 医学 离体 导管消融 核医学 生物医学工程 钻石 材料科学 放射科 心脏病学 体内 外科 复合材料 生物技术 生物
作者
Wataru Sasaki,Kazuo Matsumoto,Syunta Higuchi,Hitoshi Mori,Hidehira Fukaya,Daisuke Kawano,Naomichi Tanaka,Masataka Narita,Kenta Tsutsui,Yoshifumi Ikeda,Takahide Arai,Shintaro Nakano,Ritsushi Kato
出处
期刊:Journal of Cardiology [Elsevier BV]
标识
DOI:10.1016/j.jjcc.2023.03.006
摘要

A novel Diamond Temp™ (DT; Medtronic, Minneapolis, MN, USA) catheter has enabled performing a surface temperature-controlled ablation. The chemical vapor deposition diamond of the ablation catheter acts as a thermal radiator and is useful for effective cooling of the ablation catheter tip. However, a detailed analysis of the lesion formation with this catheter remains unknown.DT catheters were used in an excised swine heart experimental model. A cross-sectional analysis of 60-s lesions [a combination of various energy power settings (30, 40, and 50 W), and various contact forces (CF) (10, 30, and 50 g)] and a longitudinal analysis [a combination of various powers (40 W or 50 W), various CFs (10, 30, and 50 g), and various ablation times (5 s, 10 s, 15 s, 20 s, 25 s, 30 s, and 60 s)] of the DT catheter were analyzed.The maximum lesion depth, maximum diameter, and lesion volume with a 10 g ablation were significantly lower than those with a 30 g or 50 g ablation. There were no significant differences in the lesion formation between the 30 g ablation and 50 g ablation under each radiofrequency (RF) power setting. The impedance drops with steam pops were significantly greater than those without steam pops (pop (+) vs. pop (-), 26.2 ± 6.6 Ohm vs. 18.4 ± 7.1 Ohm, p = 0.0001). A non-linear, time-dependent increase in the lesion depth and diameter was observed for all power and CF settings. Comparing the lesion depth and diameter between 40 W and 50 W under the same CF setting and same ablation time, most of the settings had no significant difference.Ablation lesions created with the DT catheter were similar to other catheters. Similar ablation lesions were created with the 40 W or 50 W ablation under the same CF setting and same ablation time. Regardless of the ablation power, monitoring the general impedance during the RF application was indispensable for a safe procedure.
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