Detailed analysis of the lesion formation using a diamond tip catheter in an ex vivo experimental model.
J Cardiol
; 82(1): 76-83, 2023 07.
Article
em En
| MEDLINE
| ID: mdl-36935004
ABSTRACT
BACKGROUND:
A novel Diamond Temp™ (DT; Medtronic, Minneapolis, MN, USA) catheter has enabled performing a surface temperature-controlled ablation. The chemical vapor deposition diamond of the ablation catheter acts as a thermal radiator and is useful for effective cooling of the ablation catheter tip. However, a detailed analysis of the lesion formation with this catheter remains unknown.METHODS:
DT catheters were used in an excised swine heart experimental model. A cross-sectional analysis of 60-s lesions [a combination of various energy power settings (30, 40, and 50â¯W), and various contact forces (CF) (10, 30, and 50â¯g)] and a longitudinal analysis [a combination of various powers (40â¯W or 50â¯W), various CFs (10, 30, and 50â¯g), and various ablation times (5â¯s, 10â¯s, 15â¯s, 20â¯s, 25â¯s, 30â¯s, and 60â¯s)] of the DT catheter were analyzed.RESULTS:
The maximum lesion depth, maximum diameter, and lesion volume with a 10â¯g ablation were significantly lower than those with a 30â¯g or 50â¯g ablation. There were no significant differences in the lesion formation between the 30â¯g ablation and 50â¯g ablation under each radiofrequency (RF) power setting. The impedance drops with steam pops were significantly greater than those without steam pops (pop (+) vs. pop (-), 26.2⯱â¯6.6 Ohm vs. 18.4⯱â¯7.1 Ohm, pâ¯=â¯0.0001). A non-linear, time-dependent increase in the lesion depth and diameter was observed for all power and CF settings. Comparing the lesion depth and diameter between 40â¯W and 50â¯W under the same CF setting and same ablation time, most of the settings had no significant difference.CONCLUSION:
Ablation lesions created with the DT catheter were similar to other catheters. Similar ablation lesions were created with the 40â¯W or 50â¯W ablation under the same CF setting and same ablation time. Regardless of the ablation power, monitoring the general impedance during the RF application was indispensable for a safe procedure.Palavras-chave
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Vapor
/
Ablação por Cateter
Tipo de estudo:
Observational_studies
/
Prevalence_studies
/
Risk_factors_studies
Limite:
Animals
Idioma:
En
Revista:
J Cardiol
Assunto da revista:
CARDIOLOGIA
Ano de publicação:
2023
Tipo de documento:
Article
País de afiliação:
Japão