NDLI: Comparison of Laplacian and Bipolar ECGs for R-wave Detection during Noise

Content Provider	IEEE Xplore Digital Library
Author	Ghanem, R.N. Gillberg, J.M. Wanasek, K. Wood, N. Abeyratne, A. Mitrani, R.
Copyright Year	2006
Description	Author affiliation: Cardiac Rhythm Disease Manage., Medtronic Inc., Minneapolis, MN (Ghanem, R.N.; Gillberg, J.M.; Wanasek, K.; Wood, N.; Abeyratne, A.)
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 $V_{3})$ and lateral (precordial $V_{6})$ chest regions in 25 patients undergoing posture changes and in-office exercises. Mean peak-to-peak (Vpp ), root mean square noise $(Noise_{rms})$ 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 $V_{pp}$ was larger for the bipolar ECG compared to the Laplacian ECG on the anterior (0.65plusmn0.07 vs. 0.14plusmn0.07 mV, p<0.05) and lateral (0.65plusmn0.07 vs. 0.05plusmn0.07 mV, p<0.05) regions. Laplacian ECGs resulted in least $Noise_{rms}$ compared to bipolar ECGs (anterior: 0.02plusmn0.01 vs. 0.05plusmn0.01, p<0.05; lateral: 0.01plusmn0.01 vs. 0.07plusmn0.01, p<0.05). Bipolar and Laplacian SNRs were comparable on the anterior chest (14.05plusmn0.95 vs. 13.49plusmn0.95, p=NS). On the lateral chest, bipolar SNR was larger than Laplacian SNR (13.78plusmn0.95 vs. 8.67plusmn0.96, 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
Sponsorship	IEEE EMB
Starting Page	3994
Ending Page	3997
File Size	219580
Page Count	4
File Format	PDF
ISBN	1424400325
ISSN	1557170X
DOI	10.1109/IEMBS.2006.259381
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2006-08-30
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Laplace equations Electrocardiography Signal to noise ratio Noise reduction Cardiology Electric variables measurement Rhythm Cardiac disease Cardiovascular diseases Cities and towns
Content Type	Text
Resource Type	Article
Subject	Signal Processing Biomedical Engineering Health Informatics Computer Vision and Pattern Recognition

Sl.	Authority	Responsibilities	Communication Details
1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
5	Website/Portal (Helpdesk)	Queries regarding NDLI and its services	support@ndl.gov.in
6	Contents and Copyright Issues	Queries related to content curation and copyright issues	content@ndl.gov.in
7	National Digital Library of India Club (NDLI Club)	Queries related to NDLI Club formation, support, user awareness program, seminar/symposium, collaboration, social media, promotion, and outreach	clubsupport@ndl.gov.in
8	Digital Preservation Centre (DPC)	Assistance with digitizing and archiving copyright-free printed books	dpc@ndl.gov.in
9	IDR Setup or Support	Queries related to establishment and support of Institutional Digital Repository (IDR) and IDR workshops	idr@ndl.gov.in