Circulation, Vol 82, 1034-1038, Copyright © 1990 by American Heart Association
DE Haines and AF Verow
The purpose of this study was to correlate changes in electrical impedance
with the electrode-tissue interface temperature and to characterize the
associated events occurring at the catheter tip electrode. In a canine
model, lesions were created in vitro (n = 49) and in vivo (n = 31) and
radiofrequency power settings were varied. Electrode-tissue interface
temperature, delivered current, and voltage were recorded, and impedance
was calculated. A sudden rise in electrical impedance was seen in only two
of 17 ablations in vitro and in one of 16 ablations in vivo with a peak
electrode-tissue interface temperature of less than 100 degrees C compared
with 29 of 32 ablations in vitro (p = 0.0001) and 12 of 15 ablations in
vivo with a temperature of more than 100 degrees C (p = 0.0001). This
phenomenon was associated with the observation of boiling and popping at
the tip in in vitro preparations and tissue avulsion and thrombus formation
on the catheter tip in in vivo studies. The lesion size was directly
proportional to the peak temperature for all ablations but not to the peak
power, current, or voltage during radiofrequency catheter ablation in the
heart. Maintaining electrode-tissue interface temperature at less than 100
degrees C during radiofrequency catheter ablation in the heart may avoid
the complications associated with the sudden rise in electrical impedance.
ARTICLES
Observations on electrode-tissue interface temperature and effect on electrical impedance during radiofrequency ablation of ventricular myocardium
Department of Internal Medicine, University of Virginia School of Medicine, Charlottesville.
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