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

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 O...

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Bibliographic Details
Published in:Journal of electrocardiology 2016-09, Vol.49 (5), p.714-719
Main Authors: Salvi, Vaibhav, Clark, Elaine, Karnad, Dilip R, Macfarlane, Peter W, Panicker, Gopi Krishna, Hingorani, Pooja, Kothari, Snehal
Format: Article
Language:English
Subjects:
Body surface potential mapping
Cardiac repolarization
Cardiovascular
Diagnosis, Computer-Assisted - instrumentation
Diagnosis, Computer-Assisted - standards
Electrocardiography, Ambulatory - instrumentation
Electrocardiography, Ambulatory - methods
Electrode resistance
Electrodes
Equipment Design
Equipment Failure Analysis
Holter electrocardiography
Humans
Reference Values
Reproducibility of Results
Sensitivity and Specificity
Signal Processing, Computer-Assisted - instrumentation
Vectorcardiography
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Summary: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 Salvi et al. (2010) (1) a vector method and Panicker et al. (2012) (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 were 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.
ISSN:0022-0736
1532-8430
DOI:10.1016/j.jelectrocard.2016.06.006