Comparison of Laplacian and bipolar ECGs for R-wave detection during noise

Raja N. Ghanem, Jeffrey M. Gillberg, Kevin Wanasek, Nicole Wood, Athula Abeyratne, Raul Mitrani

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

2 Scopus citations

Abstract

Body surface Laplacian mapping localizes cardiac activity and provides more detailed distributions compared to body surface potential mapping. Systematic comparison of the performance of bipolar and Laplacian ECGs during noise has not been performed. To determine whether Laplacian ECGs (2.5cm diameter concentric rings) can reduce noise (myopotential and motion artifacts) and improve signal to noise ratio (SNR) compared to bipolar (4cm spacing) ECGs, Laplacian and bipolar ECGs were recorded from the anterior (precordial V3) and lateral (precordial V6) chest regions in 25 patients undergoing posture changes and in-office exercises. Mean peak-to-peak (Vpp), root mean square noise (Noiserms) and SNR were computed across all activities and patients. Sensing performance using an R-wave detector with an auto-adjusting exponentially decaying threshold was assessed. Across all maneuvers, mean Vpp was larger for the bipolar ECG compared to the Laplacian ECG on the anterior (0.65±0.07 vs. 0.14±0.07 mV, p<0.05) and lateral (0.65±0.07 vs. 0.05±0.07 mV, p<0.05) regions. Laplacian ECGs resulted in least Noiserms compared to bipolar ECGs (anterior: 0.02±0.01 vs. 0.05±0.01, p<0.05; lateral: 0.01±0.01 vs. 0.07±0.01, p<0.05). Bipolar and Laplacian SNRs were comparable on the anterior chest (14.05±0.95 vs. 13.49±0.95, p=NS). On the lateral chest, bipolar SNR was larger than Laplacian SNR (13.78±0.95 vs. 8.67±0.96, p<0.05). Laplacian SNR on the anterior chest was larger compared to the lateral chest, confirming that Laplacian ECGs are sensitive to mapping location. Sensing performance showed that bipolar ECGs resulted in marginally superior sensing accuracy compared to Laplacian ECGs. In conclusion, Laplacian ECGs offer no advantage in SNR compared with standard bipolar ECGs.

Original languageEnglish (US)
Title of host publication28th Annual International Conference of the IEEE Engineering in Medicine and Biology Society, EMBS'06
Pages3994-3997
Number of pages4
DOIs
StatePublished - Dec 1 2006
Externally publishedYes
Event28th Annual International Conference of the IEEE Engineering in Medicine and Biology Society, EMBS'06 - New York, NY, United States
Duration: Aug 30 2006Sep 3 2006

Publication series

NameAnnual International Conference of the IEEE Engineering in Medicine and Biology - Proceedings
ISSN (Print)0589-1019

Other

Other28th Annual International Conference of the IEEE Engineering in Medicine and Biology Society, EMBS'06
CountryUnited States
CityNew York, NY
Period8/30/069/3/06

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ASJC Scopus subject areas

  • Signal Processing
  • Biomedical Engineering
  • Computer Vision and Pattern Recognition
  • Health Informatics

Cite this

Ghanem, R. N., Gillberg, J. M., Wanasek, K., Wood, N., Abeyratne, A., & Mitrani, R. (2006). Comparison of Laplacian and bipolar ECGs for R-wave detection during noise. In 28th Annual International Conference of the IEEE Engineering in Medicine and Biology Society, EMBS'06 (pp. 3994-3997). [4030199] (Annual International Conference of the IEEE Engineering in Medicine and Biology - Proceedings). https://doi.org/10.1109/IEMBS.2006.259381