Related Experiment Video
Updated: Jul 6, 2026

Determining the Likelihood of Variant Pathogenicity Using Amino Acid-level Signal-to-Noise Analysis of Genetic Variation
Published on: January 16, 2019
[Ventricular repolarisation disorders and long QT syndrome: clinical and genetic study in 10 paediatric cases]
C Jullien1, H Patural, G Teyssier
1Département de pédiatrie, service de réanimation néonatale et pédiatrique, hôpital Nord, centre hospitalier universitaire de Saint-Etienne, Saint-Etienne cedex 02, France.
Insights
This study details 10 pediatric cases of ventricular repolarization disorders and long QT syndrome, presenting varied symptoms. Diagnosis relies on electrophysiology and genetic testing for tailored treatment strategies.
Area of Science:
- Cardiology
- Genetics
- Pediatrics
Context:
- Ventricular repolarization disorders and long QT syndrome (LQTS) are serious cardiac conditions.
- Pediatric cases present with a spectrum of clinical manifestations, from asymptomatic to life-threatening events.
Purpose:
- To describe the clinical presentation, diagnostic approaches, and management of pediatric LQTS.
- To highlight the importance of genetic investigation in diagnosing and managing these conditions.
Summary:
- The study reports on 10 pediatric patients diagnosed with ventricular repolarization disorders and LQTS.
- Clinical presentations ranged from asymptomatic cases to syncope and cardiac arrest.
- Diagnosis was established through electrophysiological studies and comprehensive genetic analysis.
Impact:
- Provides insights into the diverse clinical spectrum of pediatric LQTS.
- Emphasizes the role of genotype-guided management for improved patient outcomes.
- Contributes to a better understanding of inherited cardiac arrhythmias in children.
Abstract:
We report 10 paediatric cases of ventricular repolarisation disorders and long QT syndrome, which differed in their mode of revelation, from asymptomatic forms to syncope events or heart arrest. Diagnosis is based on electrophysiological explorations and exhaustive genetic investigation. It allows a well-codified preventive and therapeutic action according to the genotype.
Related Concept Videos
ECG Interpretation of Arrhythmias II: Atrial, Junctional and Ventricular Arrhythmias
Dysrhythmias V: Evaluating Dysrhythmias
Dysrhythmias II: Classification of Tachyarrhythmias
Mechanism of Cardiac Arrhythmias
Dysrhythmias IV: Characteristics of Bradyarrhythmias
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

