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Comparison of manual and automatic QT dispersion measurements in clinical groups

Lookup NU author(s): Dr Philip Langley, Emeritus Professor Alan MurrayORCiD


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We investigated whether automatic QT dispersion measurements are more discriminating than manual measurement in three clinical groups: myocardial infarction; arrhythmia; normals. Four automatic techniques of QT interval measurement, based on models of T wave shape, were used: i) intersection of maximum slope of T wave with baseline (QTsi), ii) intersection of linear best fit over the region 30% to 70% of peak T wave amplitude with baseline (QT30/70), iii) intersection of linear best fit over the region 10% to 30% of peak T wave amplitude (QT10/30) with baseline, and iv) minimum/maximum of 2(nd) order polynomial best fit over a 0.1 s interval commencing at 50%peak amplitude (QT2nd). There were no significant differences between dispersion lit the groups when measured manually. There were, significant differences between normal and infarct groups for all automatic techniques (p < 0.05), and between normal and arrhythmia groups for QT30/70 and QT2nd (p<0.05). Automatic techniques were better able to discriminate between normal and cardiac patient groups.

Publication metadata

Author(s): Langley P, Murray A

Publication type: Conference Proceedings (inc. Abstract)

Publication status: Published

Conference Name: COMPUTERS IN CARDIOLOGY 2001, VOL 28

Year of Conference: 2001

Pages: 645-648

Publisher: IEEE

Library holdings: Search Newcastle University Library for this item

ISBN: 0780372662