(Circulation. 1999;99:1312-1317.)
© 1999 American Heart Association, Inc.
Clinical Investigation and Reports |
LocaLisa
New Technique for Real-Time 3-Dimensional Localization of Regular Intracardiac Electrodes
From the Heart Lung Institute (F.H.M.W., E.F.D.W., R.D., H.R., R.N.W.H., E.O.R.d.M.), Department of Cardiology, University Hospital Utrecht, Utrecht, Netherlands, and Department of Cardiology (A.A.M.W.), Academic Medical Center, Amsterdam, Netherlands.
Correspondence to Fred H.M. Wittkampf, PhD, Heart Lung Institute, Department of Cardiology, University Hospital Utrecht E03.829, PO Box 85500, 3508 GA, Utrecht, Netherlands. E-mail fredwittkampf{at}compuserve.com
Background—Estimation of the 3-dimensional (3D) position of ablation electrodes from fluoroscopic images is inadequate if a systematic lesion pattern is required in the treatment of complex arrhythmogenic substrates.
Methods and Results—We developed a new technique for online 3D localization of intracardiac electrodes. Regular catheter electrodes are used as sensors for a high-frequency transthoracic electrical field, which is applied via standard skin electrodes. We investigated localization accuracy within the right atrium, right ventricle, and left ventricle by comparing measured and true interelectrode distances of a decapolar catheter. Long-term stability was analyzed by localization of the most proximal His bundle before and after slow pathway ablation. Electrogram recordings were unaffected by the applied electrical field. Localization data from 3 catheter positions, widely distributed within the right atrium, right ventricle, or left ventricle, were analyzed in 10 patients per group. The relationship between measured and true electrode positions was highly linear, with an average correlation coefficient of 0.996, 0.997, and 0.999 for the right atrium, right ventricle, and left ventricle, respectively. Localization accuracy was better than 2 mm, with an additional scaling error of 8% to 14%. After 2 hours, localization of the proximal His bundle was reproducible within 1.4±1.1 mm.
Conclusions—This new technique enables accurate and reproducible real-time localization of electrode positions in cardiac mapping and ablation procedures. Its application does not distort the quality of electrograms and can be applied to any electrode catheter.
Key Words: mapping • catheter ablation • electrophysiology
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