Comparison of the spatial QRS-T angle derived from digital ECGs recorded using conventional electrode placement with that derived from Mason-Likar electrode position

Salvi, V., Clark, E., Karnad, D. R., Macfarlane, P. W., Panicker, G. K., Hingorani, P. and Kothari, S. (2016) Comparison of the spatial QRS-T angle derived from digital ECGs recorded using conventional electrode placement with that derived from Mason-Likar electrode position. Journal of Electrocardiology, 49(5), pp. 714-719. (doi: 10.1016/j.jelectrocard.2016.06.006) (PMID:27395365)

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Abstract

Background: The spatial QRS-T angle is ideally derived from orthogonal leads. We compared the spatial QRS-T angle derived from orthogonal leads reconstructed from digital 12-lead ECGs and from digital Holter ECGs recorded with the Mason-Likar (M-L) electrode positions. Methods and results: Orthogonal leads were constructed by the inverse Dower method and used to calculate spatial QRS-T angle by (1) a vector method and (2) a net amplitude method, in 100 volunteers. Spatial QRS-T angles from standard and M-L ECGs differed significantly (57° ± 18° vs 48° ± 20° respectively using net amplitude method and 53° ± 28° vs 48° ± 23° respectively by vector method; p < 0.001). Difference in amplitudes in leads V4–V6 was also observed between Holter and standard ECGs, probably due to a difference in electrical potential at the central terminal. Conclusion: Mean spatial QRS-T angles derived from standard and M-L lead systems differed by 5°–9°. Though statistically significant, these differences may not be clinically significant.

Item Type:Articles
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Macfarlane, Professor Peter and Clark, Mrs Elaine
Authors: Salvi, V., Clark, E., Karnad, D. R., Macfarlane, P. W., Panicker, G. K., Hingorani, P., and Kothari, S.
College/School:College of Medical Veterinary and Life Sciences > Institute of Cardiovascular and Medical Sciences
College of Medical Veterinary and Life Sciences > Institute of Health and Wellbeing > Robertson Centre
Journal Name:Journal of Electrocardiology
Publisher:Elsevier
ISSN:0022-0736
Published Online:21 June 2016
Copyright Holders:Copyright © 2016 Elsevier Inc.
First Published:First published in Journal of Electrocardiology 49(5):714-719
Publisher Policy:Reproduced in accordance with the copyright policy of the publisher

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