Radiofrequency ablation-Real-time visualization of lesions and their correlation with underlying parameters.
Pacing Clin Electrophysiol
; 47(8): 994-1003, 2024 08.
Article
em En
| MEDLINE
| ID: mdl-38728067
ABSTRACT
BACKGROUND:
Lesion durability and transmurality are crucial for successful radiofrequency (RF) ablation. This study provides a model of real-time RF lesion visualization and insights into the role of underlying parameters, as local impedance (LI).METHODS:
A force-sensing, LI-sensing catheter was used for lesion creation in an ex vivo model involving cross-sections of porcine cardiac preparations. During 60 s of RF application, one measurement per second was performed regarding lesion size and available ablation parameters. In total, 1847 measurements from n = 36 lesions were performed. Power (20-50 W) and contact force (1-5 g, 10-15 g, 20-25 g) were systematically alternated.RESULTS:
Lesion formation was most prominent in the first seconds of RF application during which nonlinear lesion growth was observed (max. 1.08 mm/s for lesion depth and 2.71 mm/s for lesion diameter). Power levels determined the extent of lesion formation in the early phase. After 20 s, lesion size growth velocity approaches 0.1 mm/s at all power levels. LI changes were also highest in the first seconds (up to - 12 Ω/s) and decreased to less than - 0.1Ω/s after prolonged application.CONCLUSION:
Lesion formation in irrigated RF ablation is a nonlinear process. Final lesion size resulting from an RF application is mainly influenced by high rates of lesion growth in the first seconds of ablation. LI seems to be a good surrogate for differentiating changes in lesion formation.Palavras-chave
Texto completo:
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Base de dados:
MEDLINE
Assunto principal:
Ablação por Cateter
Limite:
Animals
Idioma:
En
Revista:
Pacing Clin Electrophysiol
Ano de publicação:
2024
Tipo de documento:
Article
País de afiliação:
Alemanha