A. Mehdirad et al., Effect of catheter tip length and position on lesion volume in temperaturecontrolled RF ablation in canine tricuspid valve annulus, J INTERV C, 2(3), 1998, pp. 279-284
Citations number
7
Categorie Soggetti
Cardiovascular & Respiratory Systems
Journal title
JOURNAL OF INTERVENTIONAL CARDIAC ELECTROPHYSIOLOGY
Background: Radiofrequency (RF) energy has been delivered to the tricuspid
valve annulus (TVA) in humans with both 4 mm and 8 mm long catheter tip ele
ctrodes to treat atrial Butter However, lesion volume with temperature cont
rolled RF delivery systems has not been previously characterized.
Methods: In 10 anesthetized canines, a single pulse of temperature controll
ed BE energy at a 70 degrees C set point, 30 second duration was delivered
with either a 7 Fr/4 mm tip or a 7 Fr/8 mm tip electrode in a position both
anterolateral and posteroseptal to the tricuspid valve annulus (TVA). Surf
ace echocardiogram was obtained prior and after ablation. The animals were
sacrificed after ablation and the lesions underwent gross and histological
examination.
Results: Lesion size, tip temperature and power were related to tip electro
de surface area (SA). Eight mm tips (SA = 59 mm(2)) tended to create signif
icantly larger lesions than 4 mm tips (SA = 29 mm(2)). Median lesion volume
was 22 vs. 1.5 mm(3), respectively. Eight mm tips were also associated wit
h higher power requirements and lower temperatures than 4 mm tips. Posteros
eptal TVA lesions tended to be larger than anterolateral lesions. No signif
icant complications were noted.
Conclusions: Using temperature controlled RF ablation, large lesions may be
safely created on the canine TVA using 7 Fr catheters with 8 mm long tips.