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Lookup NU author(s): Dr Philip Langley,
Professor Alan MurrayORCiD
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To investigate the effect of different lead exclusion criteria for the manual measurement of QT dispersion (QTd). Simultaneous 12-lead ECGs from three groups of 25 subjects were studied; healthy normal subjects, subjects with a myocardial infarction, and subjects with arrhythmias. Leads were excluded with II) small absolute T wave amplitudes, (2) small relative T wave amplitudes, and (3) small and/or large relative QT measurements. QTd was calculated as the QT range and assessed for its ability to differentiate between the normal and pathological groups. With exclusion of no leads or low absolute amplitude T waves (<50 V) significant differences were observed only between normal and myocardial infarct groups (P < 0.05). Significant differences between normal and both pathological groups were observed when excluding the lead with the smallest amplitude T wave or shortest QT (P ( 0.05), or when two leads; of either type were excluded (P < 0.005). There was good agreement between leads excluded by amplitude or QT(P < 0.01). Lead exclusion for QTd is important. Exclusion of the two smallest amplitude or two shortest QT leads from each subject produced the greatest differences between the normal and pathological groups.
Author(s): Murray A; Langley P; Di Bernardo D
Publication type: Article
Publication status: Published
Journal: Pacing and Clinical Electrophysiology
ISSN (print): 0147-8389
ISSN (electronic): 1540-8159
Publisher: Wiley-Blackwell Publishing Ltd.
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