PO-03-066 LOCAL IMPEDANCE CHANGES ARE A SUITABLE REAL TIME SURROGATE FOR LESION FORMATION IN RF-ABLATION
نویسندگان
چکیده
Radiofrequency current remains one of the most important techniques for catheter ablation. Creating durable lesions is key sufficient and safe procedures. Several possibilities were tested estimating progress lesion formation. For instance, force-time-integral, ablation index size are used to assess quality RF-application and, therefore, durability. Nevertheless, recovered conduction after acute block an issue in RF-ablation. The aim this study was evaluate local impedance (LI) changes as real time surrogate RF-lesions created using ex vivo porcine cardiac model a contact force LI sensing catheter. experimental setup consisted saline-filled container, dispersive electrode, heated thermostat circulation pump imitate conditions. Global kept at 120 Ohm well temperature 37°C. identic values RF duration force. power (20W, 30W, 40W, 50W) level electrode-tissue-coupling also systematically varied between minor full coupling. All parameters (power, temperature, global impedance, force, ETC, size) measured constantly during 60 seconds RF-application, enabling real-time correlation size. In case audible steam pop, application stopped. Including total 8654 measurements into analysis, maximum diameter depth 9.51 ± 1.91 mm 7.29 2.50 average. correlated with (r= 0,78, p<0,001), (r=0,652, p<0,001). After significant declines beginning it slowly approximates minimum. Lesion on other hand, rises exponentially first gets closer more than 25 seconds. With decreasing growth end decrease low (Figure 1). formation RF-ablation not linear current. Local seem be suitable assessing
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ژورنال
عنوان ژورنال: Heart Rhythm
سال: 2023
ISSN: ['1556-3871', '1547-5271']
DOI: https://doi.org/10.1016/j.hrthm.2023.03.994