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Arrhythmias, Electrophysiology and Electrocardiography

Which Lead for Q-T Interval Measurements?

Davey P.P.

Author affiliations

Department of Cardiovascular Medicine, John Radcliffe Hospital, Oxford, UK

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Cardiology 2000;94:159–164

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Article / Publication Details

First-Page Preview
Abstract of Arrhythmias, Electrophysiology and Electrocardiography

Published online: March 02, 2001
Issue release date: February 2001

Number of Print Pages: 6
Number of Figures: 2
Number of Tables: 4

ISSN: 0008-6312 (Print)
eISSN: 1421-9751 (Online)

For additional information: https://www.karger.com/CRD

Abstract

There are several Q-T interval measures (individual lead, mean Q-T interval or Q-T dispersion) from a 12-lead ECG. Which should be used? As the ECG provides twelve different measures of the heart’s ‘true’ Q-T interval, and as, ‘a priori’, no one measure is any better or worse than any other measure at estimating the ‘true’ Q-T interval, the best measure is the average of these twelve measures, i.e., the mean Q-T interval. The best single lead to measure the Q-T interval is the lead that relates most closely to the mean Q-T interval which in 49 subjects with cardiac diseases was lead V3, then lead II. The longest lead Q-T interval relates poorly to the mean and to the individual lead Q-T intervals and therefore carried information different to and quite unique from these measures. This unique information is Q-T dispersion which relates well to the longest lead Q-T interval (r = 0.71, p < 0.001).

© 2001 S. Karger AG, Basel


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Article / Publication Details

First-Page Preview
Abstract of Arrhythmias, Electrophysiology and Electrocardiography

Published online: March 02, 2001
Issue release date: February 2001

Number of Print Pages: 6
Number of Figures: 2
Number of Tables: 4

ISSN: 0008-6312 (Print)
eISSN: 1421-9751 (Online)

For additional information: https://www.karger.com/CRD


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