A new automated approach using seven morphological variables provides a more complete description of ventricular repolarization compared to the conventional QT interval alone.
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Seven QT-independent variables may refine repolarization assessment; leaves open validation in outcome studies.
Ten morphological variables describing electrocardiographic ventricular repolarization were considered, an addition to the conventional QT interval, in order to have a more complete description of the phenomenon. The computer program QTNEW was developed in order to analyze the repolarization segment automatically and to measure the variables. A final list of seven variables was obtained after the application of dimensionality-reduction techniques and did not include the QT interval. Six variables were independent of the QT, six were heart-rate independent, and all were age and body surface-area independent.< <ETX xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">></ETX>
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Merri et al. (2003) studied this question.
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