Abstract
Transient interruption of accessory pathway (AP) conduction is often encountered during creation of RF lesions, with return of conduction after seconds to weeks. Maximum catheter tip temperature (Tmax) has not been shown to be a good predictor of successful RF ablation. However, other indices related to catheter tip temperature (T) may predict permanent AP interruption. Ninety-one successful RF applications in 58 patients (mean age 11.9 +/- 5.5 years, 38 WPW syndrome, 18 concealed AP, 2 both) were reviewed retrospectively. Forty-two RF applications were transiently successful, with a median time of AP conduction recurrence of 120 seconds (sec; range, 1 sec to > 1 day). This group was compared with 49 permanently successful RF applications. T was measured and controlled using the Medtronic Atakr system (San Jose, CA, USA). RF lesion duration, power output, Tmax and time to Tmax (tmax) were not significantly different between the two groups. By univariate analysis, each of the following indices was able to discriminate between the transient and permanent lesions, and highly correlated with one another, T at the moment of AP interruption (Tsucc; transient 55.0 +/- 7.9 degrees C vs permanent 49.8 +/- 7.7 degrees C, P = 0.0025), tim...Continue Reading
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