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- Title
Comparison of two catheters measuring local impedance: local impedance variation vs lesion characteristics and steam pops.
- Authors
Amemiya, Miki; Takigawa, Masateru; Goya, Masahiko; Martin, Claire A.; Anzai, Tatsuhiko; Takahashi, Kunihiko; Shimizu, Yuki; Ikenouchi, Takashi; Kamata, Tatsuaki; Yamamoto, Tasuku; Nishimura, Takuro; Shirai, Yasuhiro; Tao, Susumu; Miyazaki, Shinsuke; Sasano, Tetsuo
- Abstract
<bold>Purpose: </bold>The size of the distal electrode and the method of measuring local impedance (LI) are different between the IntellaNav MiFi-OI™ (MiFi-OI) and IntellaNav STABLE POINT™ (SP) catheters. We investigated the impact of these differences on LI, efficacy, and safety of radiofrequency (RF) applications.<bold>Methods: </bold>RF applications at a range of powers (30 W, 40 W, and 50 W), contact forces (10 g and 20 g), and durations (10-120 s) were performed in excised porcine hearts (N = 48). LI variation was defined by δLI-drop (= initial LI - post-RF LI) and %LI-drop (= δLI-drop/initial LI) × 100, and the relationship between lesion characteristics and LI variation was compared.<bold>Results: </bold>A total of 576 lesions were examined. Although absolute δLI-drop during RF applications was significantly larger for the SP than MiFi-OI catheter (47[31-65]ohm for SP vs 37[24-51]ohm for MiFi-OI, p < 0.0001), %LI-drop was similar (23.3 [15.5-30.6]% in SP vs 24.9[17.3-32.5]% in MiFi-OI, p = 0.10). Although lesions produced by both catheters were similarly correlated with LI variation, the SP catheter produced generally larger lesions (depth; 5.0 [3.7-6.1]mm vs 4.7 [3.3-6.0]mm, p = 0.06; surface areas, 46.9 [36.8-58.8]mm2 vs 44.7 [34.3-55.5]mm2, p = 0.02; volume, 321 [165-533]mm3 vs 265[141-471]mm3, p = 0.02). Steam pops were similarly observed with both catheters. In both catheters, %LI-drop was superior to δLI-drop in correlation to lesion size (p < 0.0001) and in predicting steam pops (p < 0.01).<bold>Conclusions: </bold>Although no difference in safety profile is observed between MiFi-OI and SP catheters, the SP catheter produces larger lesions. %LI-drop is superior to δLI-drop in correlation to lesion size and in predicting steam pops as well as in normalizing the difference between catheters.
- Publication
Journal of Interventional Cardiac Electrophysiology, 2022, Vol 65, Issue 2, p419
- ISSN
1383-875X
- Publication type
Article
- DOI
10.1007/s10840-022-01214-z