Electrode Contact Force-Controlled Bipolar Radiofrequency Ablation: Different Effects on Lesion Size between Dual- and Single-Bath Preparations.
Pacing Clin Electrophysiol
; 40(3): 223-231, 2017 Mar.
Article
em En
| MEDLINE
| ID: mdl-27943352
ABSTRACT
BACKGROUND:
During bipolar (BIP) radiofrequency (RF) ablation using two catheters in humans, each catheter is placed in separate cardiac chambers or spaces. We developed a contact force-controlled experimental preparation, and compared measurements made with two catheters placed in a single bath (SB), versus each catheter placed in separate baths, in order to assess the preparation-dependent differences in the results of BIP-RF ablation.METHODS:
In the SB experiments, a porcine heart was placed in the center of the bath, while in the dual-bath (DB) experiments, it was placed between two half baths communicating through windows.RESULTS:
The initial impedance was greatest (110.5 ± 7.2 Ω) with the BIP-DB, followed by the BIP-SB (92.0 ± 5.6 Ω) and the unipolar (UNIP) DB (84.9 ± 4.7 Ω) configurations. During 50-W ablation for 60 seconds at a 20-g contact force, the root mean square voltage was 75.7 ± 2.5 V in the BIP-DB, 68.0 ± 2.1 V in the BIP-SB, and 66.8 ± 2.0 V in the UNIP-DB. The mean surface lesion diameters were similar among the three configurations. However, the endocardial lesion depth was 5.60 ± 0.56 mm with the BIP-DB, 4.71 ± 0.64 mm with the BIP-SB, and 4.24 ± 0.58 mm with the UNIP-DB configuration. On average, the endocardial lesions were significantly deeper than the epicardial ones.CONCLUSIONS:
BIP ablation created much deeper lesions as compared to UNIP ablation. Lesion depth could be different depending on experimental preparation, and contact force-controlled DB preparation may be a much more appropriate model for studying the effects of BIP ablation.Palavras-chave
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Base de dados:
MEDLINE
Assunto principal:
Técnicas de Cultura de Órgãos
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Cloreto de Sódio
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Modelos Animais
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Eletrodos
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Ventrículos do Coração
Tipo de estudo:
Evaluation_studies
Limite:
Animals
Idioma:
En
Revista:
Pacing Clin Electrophysiol
Ano de publicação:
2017
Tipo de documento:
Article
País de afiliação:
Japão