Related Experiment Video
Updated: May 14, 2026

Point of Care Transcranial Color-Coded Duplex Ultrasound of the Middle Cerebral Artery
Published on: August 9, 2024
T-peak to T-end abnormality in pediatric patients with syncope
Hamid Amoozgar1, Mohammad Hosseiniasl
1Department of Pediatrics, Division of Pediatric Cardiology, Shiraz, Iran.
Objective:
The purpose of this study was to examine the relationship between T-peak-to-T-end interval and its dispersion in children with syncope to detect possible repolarization abnormalities in these patients.
Methods:
We enrolled 19 patients with a positive tilt test for syncope (7 boys, 12 girls) and 35 participants with normal results on the test.
Findings:
Mean age was 11.4±3.1 years in patients and 10.0±5.1 years in controls (P =0.27). The T-peak-to-T-end interval in lead V1 was significantly longer in patients with a positive tilt test (0.36±0.062 vs. 0.32±0.071, P=0.007). T-peak-to-T-end interval dispersion was significantly greater in the group of patients (0.15±0.07 vs. 0.11±0.04, P±0.003).
Conclusion:
The T-peak-to-T-end interval in lead V1 and T-peak-to-T-end dispersion were significantly larger in patients with a positive tilt test. Our findings suggest a depolarization abnormality in children with syncope.
Related Concept Videos
Dysrhythmias III: Characteristics of Dysrhythmias
Transient Ischemic Attack l: Introduction
Cardiac Action Potential
The cardiac action potential process involves a series of phases characterized by the movement of ions across the cardiac cell membranes, leading to the depolarization and repolarization of the cardiac myocytes.
Ionic Basis of Cardiac Action Potentials
Dysrhythmias II: Classification of Tachyarrhythmias
Cardiovascular System Abnormal Findings I: Inspection and Palpation
Abnormal findings observed during an inspection
Dysrhythmias IV: Characteristics of Bradyarrhythmias

