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Updated: May 12, 2026

Transthoracic Speckle Tracking Echocardiography for the Quantitative Assessment of Left Ventricular Myocardial Deformation
Published on: October 20, 2016
Left ventricular hypertrophy amplifies the QT, and Tp-e intervals and the Tp-e/ QT ratio of left chest ECG
Zhao Zhao1, Zuyi Yuan, Yuqiang Ji
1Department of Cardiology, Key Laboratory of Environmental Genes Related to Diseases, Ministry of Education, the First Affiliated Hospital of Medical College, Xi'an Jiaotong University, Xi'an 710061, China.
Objective:
To evaluate the changes in Tp-e interval (an interval from the peak to the end of the T wave), QT interval and Tp-e/QT ratio of the body surface ECG in patients with left ventricular hypertrophy (LVH).
Methods:
The Tp-e interval and QT interval were measured on body surface ECGs in 42 patients without either hypertension or LVH (control group), 41 patients having hypertension but not LVH (non-LVH group), and 38 patients with both hypertension and LVH (LVH group).
Results:
The mean corrected QT (QTc) interval, and mean corrected Tp-e[T(p-e)c] interval were significantly longer in the LVH group (0.430±0.021s vs. 0.409±0.019s, p < 0.01; 0.098±0.013s vs. 0.088±0.011s, respectively) than those in the control group. The Tp-e/QT ratio was also amplified in LVH group (0.232±0.028 vs.0.218±0.027) (p < 0.05).
Conclusion:
LVH increased the QT interval, Tp-e interval and Tp-e/QT ratio of the body surface ECG.
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