Non-Invasive Estimates of Left Atrial Activation in a Patient with Dissociated Left Atrial Tachycardia following Ablation of Atrial Fibrillation
Platonov, Pyotr; Nault, I.; Stridh, Martin; Holmqvist, Fredrik, et al. (2009). Non-Invasive Estimates of Left Atrial Activation in a Patient with Dissociated Left Atrial Tachycardia following Ablation of Atrial Fibrillation CINC: 2009 36TH Annual Computers In Cardiology Conference, 133 - 136. 36th Annual Computers in Cardiology Conference, 2009. Park City, UT, United States: IEEE - Institute of Electrical and Electronics Engineers Inc.
Conference Proceeding/Paper
|
Published
|
English
Authors:
Platonov, Pyotr
;
Nault, I.
;
Stridh, Martin
;
Holmqvist, Fredrik
, et al.
Department:
Cardiology
Department of Electrical and Information Technology
Signal Processing-lup-obsolete
Research Group:
Signal Processing-lup-obsolete
Abstract:
Introduction: Interatrial frequency gradient is used to guide catheter ablation of atrial fibrillation (AF) but reliable tools for its non-invasive estimation are lacking. We present a patient with dissociated left and right atrial rhythms that allows identification of sum face ECG leads that closely reflect left atrial activity. Methods: 12-lead ECG was recorded simultaneously with electrograms from the right and left atrial appendages (RAA/LAA). AF frequency spectra have been calculated from all 12 leads using spatiotemporal QRST cancellation and Welch periodogram. The dominating atrial cycle length (ACL) in the surface ECG leads was subsequently compared with ACL(LAA). Results: RAA and LAA cycle lengths were 1276 ins and 252 ins respectively. Of all surface ECG leads, AF frequency spectra in leads VI and aVR demonstrated the best agreement with ACL(LAA) showing prominent peaks corresponding to the LAA activation frequency. Conclusion: Leads VI and aVR contain a prominent left atrial component that has to be considered when interpreting fibrillatry activity from sum face ECG.
Cite this