Key result
Radiofrequency catheter ablation at a 90° contact angle resulted in significantly smaller local impedance drops and lesion widths compared to a 30° angle for both MiFi and STABLEPOINT catheters.
Why the study?
Data on the effects of catheter contact angle on local impedance parameters during radiofrequency catheter ablation are scarce.
Does catheter contact angle influence local impedance drop and lesion size during radiofrequency catheter ablation in a porcine model?
Does catheter contact angle influence local impedance drop and lesion size during radiofrequency catheter ablation in a porcine model?
In a porcine model, a perpendicular (90°) catheter contact angle during radiofrequency ablation resulted in smaller local impedance drops and narrower lesion widths compared to a 30° angle, without affecting lesion depth.
Contact angle affects impedance and lesion width in porcine ablation; leaves open optimal strategies and human translation.
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.
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Matsuura et al. (2021) studied Radiofrequency catheter ablation. Radiofrequency catheter ablation at different contact angles (30°, 45°, and 90°) vs. Different contact forces (0, 5, 10, 20, and 30 g) and angles was evaluated on Local impedance (LI) rise, LI drop, and lesion size. Radiofrequency catheter ablation at a 90° contact angle resulted in significantly smaller local impedance drops and lesion widths compared to a 30° angle for both MiFi and STABLEPOINT catheters.
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