Noncontact radio-frequency ablation for obtaining deeper lesions.
IEEE Trans Biomed Eng
; 50(2): 218-23, 2003 Feb.
Article
em En
| MEDLINE
| ID: mdl-12665035
Radio-frequency (RF) cardiac catheter ablation has been very successful for treating some cardiac arrhythmias, however, the success rate for ventricular tachycardias is still not satisfactory. Some existing methods for developing deeper lesions include active cooling of the electrode and modifying the electrode shape. We propose a method of noncontact ablation, to solve this problem. We apply 120 W of power through an 8-mm electrode for a 120-s duration, with distances from 0 to 3 mm between electrode and myocardium, to create lesions in myocardium. We apply flow rates of 1, 3, and 5 L/min to determine their effect. Results show that with an optimal distance from 0.5 to 1.5 mm between electrode and myocardium, we increase lesion depth from 7.5 mm for contact ablation to 9.5 mm for noncontact ablation. For different flow rates, the optimal distance various. The effect of flow rate is not obvious. Higher flow rate does not lead to a deeper lesion.
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Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Técnicas Biossensoriais
/
Ablação por Cateter
/
Terapia por Radiofrequência
/
Ventrículos do Coração
Tipo de estudo:
Diagnostic_studies
/
Evaluation_studies
Limite:
Animals
/
Humans
Idioma:
En
Revista:
IEEE Trans Biomed Eng
Ano de publicação:
2003
Tipo de documento:
Article
País de afiliação:
Estados Unidos
País de publicação:
Estados Unidos