QT dispersion
Also written as: QTd — QT dispersion
Measure of spatial heterogeneity in ventricular repolarization, assessed on 12-lead ECG as a marker of arrhythmic risk in athletes.
Full Definition
QT dispersion represents the difference between the maximum and minimum QT intervals measured across the 12 leads of an electrocardiogram, reflecting spatial variation in ventricular repolarization. In sports cardiology, increased QT dispersion may indicate heightened risk for ventricular arrhythmias and sudden cardiac death in athletes. Normal values are typically less than 40-50 milliseconds, though athletic training can influence these measurements. Evaluation of QT dispersion requires careful attention to lead quality and measurement standardization, as technical factors can significantly affect results.
Usage
Usage note: May be abbreviated as QTd; ensure distinction from QT interval measurements in clinical reports.
In Context
- "Elevated QT dispersion in the baseline ECG prompted further cardiac evaluation before athletic clearance." — Preparticipation examination report
- "The study examined QT dispersion as a predictor of arrhythmic events in endurance athletes." — Research publication