Manifestation of left atrial events in the surface electrocardiogram during atrial fibrillation

S. Petrutiu, Alan V. Sahakian, W. G. Fisher, S. Swiryn

Research output: Chapter in Book/Report/Conference proceedingConference contribution

4 Scopus citations


In most patients, atrial fibrillation (AF) is initiated by pulmonary veins foci. We investigated whether these left atrial events are reflected in the surface electrocardiogram (ECG) and whether additional information can be obtained from recording posterior leads in patients with AF. In 7 patients, we identified 51 5-second segments with a significant frequency gradient between right (RA) and left (LA) intra-atrial electrograms, as well as frequency changes from segment to segment in the same patient. QRS-T cancellation methods were used to isolate atrial activity in the surface ECG, and peak frequencies were computed. Peak frequencies of posterior leads were very similar (6.0 ± 1.3 Hz for V7, 5.9 ± 1.4 Hz for V8, 6.0 ± 1.1 Hz for V9, 6.0 ± 1.3 Hz for V10). Lead V9 seemed to have the best signal quality and was chosen for further analysis. We found a strong correlation between V1 and RA and between V9 and LA, 0.98 and 0.93 respectively, while the lowest correlation was found between lead V1 and LA, 0.64, p < 0.00001. Magnitude-Squared Coherence values were highest between V1 and RA and lowest between V1 and LA.

Original languageEnglish (US)
Title of host publication2006 Computers in Cardiology, CIC
PublisherIEEE Computer Society
Number of pages4
ISBN (Print)1424425328, 9781424425327
StatePublished - Jan 1 2006
Event2006 Computers in Cardiology, CIC - Valencia, Spain
Duration: Sep 17 2006Sep 20 2006

Publication series

NameComputers in Cardiology
ISSN (Print)0276-6574


Other2006 Computers in Cardiology, CIC

ASJC Scopus subject areas

  • Computer Science Applications
  • Cardiology and Cardiovascular Medicine


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