Statistical Accuracy of a Moving Equivalent Dipole Method to Identify Sites of Origin of Cardiac Electrical Activation

Antonis A. Armoundas, Andrew B. Feldman, Ramakrishna Mukkamala, Bin He, Thomas J. Mullen, Paul A. Belk, Yueh Z. Lee, Richard J. Cohen

Research output: Contribution to journalArticlepeer-review

20 Scopus citations


While radio frequency (RF) catheter ablation (RCA) procedures for treating ventricular arrhythmias have evolved significantly over the past several years, the use of RCA has been limited to treating slow ventricular tachycardias (VTs). In this paper, we present preliminary results from computer and animal studies to evaluate the accuracy of an algorithm that uses the single equivalent moving dipole (SEMD) model in an infinite homogeneous volume conductor to guide the RF catheter to the site of origin of the arrhythmia. Our method involves measuring body surface electrocardiographic (ECG) signals generated by arrhythmic activity and by bipolar current pulses emanating from a catheter tip, and representing each of them by a SEMD model source at each instant of the cardiac cycle, thus enabling rapid repositioning of the catheter tip requiring only a few cycles of the arrhythmia. We found that the SEMD model accurately reproduced body surface ECG signals with a correlation coefficients >0.95. We used a variety of methods to estimate the uncertainty of the SEMD parameters due to measurement noise and found that at the time when the arrhythmia is mostly localized during the cardiac cycle, the estimates of the uncertainty of the spatial SEMD parameters (from ECG signals) are between 1 and 3 mm. We used pacing data from spatially separated epicardial sites in a swine model as surrogates for focal ventricular arrhythmic sources and found that the spatial SEMD estimates of the two pacing sites agreed with both their physical separation and orientation with respect to each other. In conclusion, our algorithm to estimate the SEMD parameters from body surface ECG can potentially be a useful method for rapidly positioning the catheter tip to the arrhythmic focus during an RCA procedure.

Original languageEnglish (US)
Pages (from-to)1360-1370
Number of pages11
JournalIEEE Transactions on Biomedical Engineering
Issue number12
StatePublished - Dec 2003
Externally publishedYes


  • Arrhythmias
  • Catheter ablation
  • Equivalent moving dipole

ASJC Scopus subject areas

  • Biomedical Engineering


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