Why the study?
Does QT dispersion accurately represent spatial heterogeneity of ventricular repolarization (measured by T wave residuum) in normal subjects and patients with cardiac disease?
Does QT dispersion accurately represent spatial heterogeneity of ventricular repolarization (measured by T wave residuum) in normal subjects and patients with cardiac disease?
QT dispersion measured on standard 12-lead ECGs does not accurately reflect true spatial heterogeneity of ventricular repolarization, challenging its utility as a surrogate marker for this phenomenon.
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QT dispersion should not substitute for TWR in assessing repolarization heterogeneity; leaves open its clinical utility pending prospective validation.
Malik et al. (2000) studied this question.
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