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Lookup NU author(s): Dr Fiona Smith,
Dr Philip Langley,
Dr John Bourke,
Emeritus Professor Alan MurrayORCiD
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Multichannel magnetocardiograms (MCGs) and 12-lead ECGs were recorded simultaneously using the PTB multichannel SQUID system from 8 normal volunteers. An automatic method for QT interval measurement was used to determine T wave end with measurements made over 10 consecutive beats in both the MCG and ECG. Channels/leads with small absolute T wave amplitudes and smallest and longest QT measurements were excluded from the analysis. QT dispersion, expressed as the QT interval range, was calculated for a single beat and the average QT interval for each channel/lead over 10 beats.Mean QT dispersion measurement (standard deviation) for the single beat was 44 (26) ms for MCG and 37 (35) ms for ECG over all subjects. Averaging over 10 beats reduced mean QT dispersion to 36.1 (14.6) ms for MCG and 20.9 (13.2) ms for ECG. QT dispersion in the MCG was greater than in the ECG, by 7 ms for the single beat and by 15 ms (p < 0.03) for averaged data over all subjects.Averaging influenced ventricular dispersion measurements in both MCG and ECG waveforms. There were differences in dispersion of ventricular repolarisation time between ECG and MCG, with MCG significantly greater than ECG for averaged data.
Author(s): Smith FE, Langley P, Steinhoff U, Trahms L, Koch H, van Leeuwen P, Bourke JP, Murray A
Publication type: Conference Proceedings (inc. Abstract)
Publication status: Published
Conference Name: Computers in Cardiology 2004
Year of Conference: 2004
Online publication date: 11/07/2005
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