TY - JOUR
T1 - Temperature and impedance monitoring during radiofrequency catheter ablation of slow AV node pathway in patients with atrioventricular node reentrant tachycardia
AU - Wen, Zu Chi
AU - Chen, Shih Ann
AU - Chiang, Chern En
AU - Tai, Ching Tai
AU - Lee, Shih Huang
AU - Chen, Yi-Jen
AU - Yu, Wen Chung
AU - Huang, Jin Long
AU - Chang, Mau Song
PY - 1996/12/13
Y1 - 1996/12/13
N2 - This study was designed to observe the changes of temperature and impedance and to find the role of temperature control in radiofrequency ablation of slow pathways in patients with AV node reentrant tachycardia. Power, impedance and temperature were measured during each application of radiofrequency energy while the generator was operated in the power control mode. A total of 760 applications were delivered in 76 patients. The success rate was 100% without recurrence during a follow-up period of 8 ± 13 months. The mean catheter tip temperature associated with successful ablation was 51.3 ± 5.4°C (range 45°C to 64°C), and significantly higher than the unsuccessful pulses (48.7 ± 16.2°C, P <0.05). The mean temperature was 49.8 ± 3.1°C during accelerated junctional rhythm, significantly higher than the pulses without this rhythm. The mean temperature correlated well with early decrease of impedance (r = 0.71, P <0.001), and an early decrease of impedance more than 5 ohms had an 87% positive predictive value for adequate tissue heating. These data suggested that, if temperature monitoring was available, setting the target temperature at about 51°C could achieve adequate tissue heating for successful ablation of slow pathway; if not, impedance monitoring with an early decrease of impedance >5 ohms could predict adequate tissue heating.
AB - This study was designed to observe the changes of temperature and impedance and to find the role of temperature control in radiofrequency ablation of slow pathways in patients with AV node reentrant tachycardia. Power, impedance and temperature were measured during each application of radiofrequency energy while the generator was operated in the power control mode. A total of 760 applications were delivered in 76 patients. The success rate was 100% without recurrence during a follow-up period of 8 ± 13 months. The mean catheter tip temperature associated with successful ablation was 51.3 ± 5.4°C (range 45°C to 64°C), and significantly higher than the unsuccessful pulses (48.7 ± 16.2°C, P <0.05). The mean temperature was 49.8 ± 3.1°C during accelerated junctional rhythm, significantly higher than the pulses without this rhythm. The mean temperature correlated well with early decrease of impedance (r = 0.71, P <0.001), and an early decrease of impedance more than 5 ohms had an 87% positive predictive value for adequate tissue heating. These data suggested that, if temperature monitoring was available, setting the target temperature at about 51°C could achieve adequate tissue heating for successful ablation of slow pathway; if not, impedance monitoring with an early decrease of impedance >5 ohms could predict adequate tissue heating.
KW - AV node reentrant tachycardia
KW - radiofrequency ablation
KW - temperature monitoring
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U2 - 10.1016/S0167-5273(96)02833-1
DO - 10.1016/S0167-5273(96)02833-1
M3 - Article
C2 - 9024914
AN - SCOPUS:0030582650
SN - 0167-5273
VL - 57
SP - 257
EP - 263
JO - International Journal of Cardiology
JF - International Journal of Cardiology
IS - 3
ER -