Key result
Reconstructing 3D positions from left ventricular cylinder coordinates using a half-ellipsoid model yielded a 3D reconstruction error of 9±8% of the ventricular length.
Why the study?
How accurate is a half-ellipsoid model for reconstructing 3D positions from left ventricular cylinder coordinates during catheter ablation?
How accurate is a half-ellipsoid model for reconstructing 3D positions from left ventricular cylinder coordinates during catheter ablation?
A half-ellipsoid model can reconstruct 3D positions from left ventricular cylinder coordinates with an error of 9 ± 8% of ventricular length, which is accurate enough for use during catheter ablation.
Hypothesis-generating for LV 3D localization in ablation; prospective validation required before clinical use.
Electrocardiographic Body Surface Mapping can assist in procedures for catheter ablation of cardiac arrhythmias, by providing an estimate of the site of origin of an arrhythmia. The authors' localization methods provide their results in left ventricular cylinder coordinates (LVCC). It would be preferable if localization results were presented in the radiographic views, possibly superimposed on the X-ray images. This requires computation of a position on the endocardial surface of the left ventricular wall from LVCC. Perfect translation between a position on the endocardial wall and cylinder coordinates would be possible if the geometry of the wall were perfectly known. Unfortunately, little is known about the wall geometry in practice. Therefore, the authors investigated how well one can reconstruct 3D positions from LVCC with limited means, by computing LVCC from biplane radiographic images, and reconstructing the positions from the LVCC. The authors' model of the wall consisted of a half-ellipsoid, scaled to the individual ventricular length and diameter. The method was evaluated using 111 catheter positions obtained in 8 patients. The reconstruction error in 3D space was 9/spl plusmn/8% of the ventricular length. The method is therefore accurate enough to be useful during a catheter ablation procedure.
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Potse et al. (2002) studied Cardiac arrhythmias (n=8). 3D position reconstruction from left ventricular cylinder coordinates was evaluated on Reconstruction error in 3D space. Reconstructing 3D positions from left ventricular cylinder coordinates using a half-ellipsoid model yielded a 3D reconstruction error of 9±8% of the ventricular length.
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