Related Experiment Video
Updated: Jun 1, 2026

Transthoracic Speckle Tracking Echocardiography for the Quantitative Assessment of Left Ventricular Myocardial Deformation
Published on: October 20, 2016
QT dispersion measured by automatic computerized 12-lead electrocardiography contributes significantly to detection
R Izumi1, R Shinohata, N Ohmaru
1Department of Medical Technology, Okayama University Graduate School of Health Sciences, Kita-ku, Okayama, Japan.
Abstract:
This study assessed the diagnostic value of QT dispersion for left ventricular hypertrophy (LVH) as determined by echocardiography. The QT and QRS interval parameters were determined automatically using computerized 12-lead electrocardiography in 153 Japanese out-patients. Corrected QT dispersion (QTcD) and maximal QRS duration (MaxQRS) were significantly correlated with left ventricular mass index. The sum of QTcD and MaxQRS showed the highest correlation with left ventricular mass index among QT and QRS interval parameters and their combinations. The cut-off points for LVH discrimination in this study were different to those reported in Western, mainly Caucasian, populations, suggesting the need for ethnicity-specific LVH detection criteria. A scoring system derived from multiple logistic regression analysis, employing a combination of QTcD, QRS time-voltage product and ST-T change, showed a specificity of 86.3%. It was concluded that QTcD, in addition to QRS time-voltage product and ST-T change, improved the detection of LVH.
Related Concept Videos
Electrocardiogram
Three major waveforms are present in a typical ECG recording: the P wave, the QRS complex, and the T...
Rheumatic Heart Disease II: Clinical Manifestations and Diagnostic Studies
Cardiomyopathy III: Hypertrophic Cardiomyopathy
Acute Coronary Syndrome III: Diagnostic Studies
Aortic Regurgitation II: Clinical Features and Diagnostic Tests
Dysrhythmias V: Evaluating Dysrhythmias
