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Catheter contact angle influences local impedance drop during radiofrequency catheter ablation: Insight from a porcine experimental study with 2 different LI-sensing catheters
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  • Gen Matsuura,
  • Hidehira Fukaya,
  • Emiyu Ogawa,
  • Sota Kawakami,
  • Hitoshi Mori,
  • Daiki Saito,
  • Tetsuro Sato,
  • Hironori Nakamura,
  • Naruya Ishizue,
  • Jun Oikawa,
  • Jun Kishihara,
  • Shinichi Niwano,
  • Junya Ako
Gen Matsuura
Kitasato University School of Medicine

Corresponding Author:gen.matsu.41@gmail.com

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Hidehira Fukaya
Kitasato University School of Medicine
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Emiyu Ogawa
Kitasato University School of Medicine
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Sota Kawakami
Kitasato University School of Medicine
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Hitoshi Mori
Saitama Medical University International Medical Center
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Daiki Saito
Kitasato University School of Medicine
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Tetsuro Sato
Kitasato University School of Medicine
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Hironori Nakamura
Kitasato University School of Medicine
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Naruya Ishizue
Kitasato University School of Medicine
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Jun Oikawa
Kitasato University School of Medicine
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Jun Kishihara
Kitasato University School of Medicine
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Shinichi Niwano
Kitasato University School of Medicine
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Junya Ako
Kitasato University School of Medicine
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Abstract

Background: Local impedance (LI) can indirectly measure catheter contact and tissue temperature during radiofrequency catheter ablation (RFCA). However, data on the effects of catheter contact angle on LI parameters are scarce. This study aimed to evaluate the influence of catheter contact angle on LI changes and lesion size with 2 different LI-sensing catheters in a porcine experimental study. Methods: Lesions were created by the INTELLANAV MiFi™ OI (MiFi) and the INTELLANAV STABLEPOINT™ (STABLEPOINT). RFCA was performed with 30 watts and a duration of 30 seconds. The CF (0, 5, 10, 20, and 30 g) and catheter contact angle (30°, 45°, and 90°) were changed in each set (n=8 each). The LI rise, LI drop, and lesion size were evaluated. Results: The LI rise increased as CF increased. There was no angular dependence with the LI rise under all CFs in the MiFi. On the other hand, the LI rise at 90° was lower than at 30° under 5 and 10 g of CF in STABLEPOINT. The LI drop increased as CF increased. Regarding the difference in catheter contact angles, the LI drop at 90° was lower than that at 30° for both catheters. The maximum lesion widths and surface widths were smaller at 90° than at 30°, whereas there were no differences in lesion depths. Conclusion: The LI drop and lesion widths at 90° were significantly smaller than those at 30°, although the lesion depths were not different among the 3 angles for the MiFi and STABLEPOINT.
15 Sep 2021Submitted to Journal of Cardiovascular Electrophysiology
16 Sep 2021Submission Checks Completed
16 Sep 2021Assigned to Editor
23 Sep 2021Reviewer(s) Assigned
28 Oct 2021Review(s) Completed, Editorial Evaluation Pending
30 Oct 2021Editorial Decision: Revise Minor
23 Nov 20211st Revision Received
29 Nov 2021Submission Checks Completed
29 Nov 2021Assigned to Editor
29 Nov 2021Reviewer(s) Assigned
26 Dec 2021Review(s) Completed, Editorial Evaluation Pending
02 Jan 2022Editorial Decision: Accept
Mar 2022Published in Journal of Cardiovascular Electrophysiology volume 33 issue 3 on pages 380-388. 10.1111/jce.15356