Congenital long QT syndrome: diagnosis and management in pediatric patients

Area of Science:

• Cardiology
• Genetics
• Electrophysiology

Background:

• Long QT syndrome (LQTS) is a genetic disorder characterized by electrocardiographic abnormalities.
• It presents with a high incidence of syncope and sudden cardiac death (SCD).
• Diagnosis is suggested by ventricular repolarization abnormalities prolonging the corrected QT interval.

Purpose of the Study:

• To outline the diagnostic criteria for Long QT syndrome.
• To discuss risk stratification for sudden cardiac death (SCD) in LQTS patients.
• To review current therapeutic strategies for managing LQTS and preventing SCD.

Main Methods:

• Genetic screening to identify specific Long QT syndrome subtypes.
• Assessment of corrected QT interval duration for diagnostic and prognostic value.
• Evaluation of patient history, including prior cardiac events and family history of SCD.

Main Results:

• Longer QT durations, prior cardiac events, and family history of SCD increase the risk of SCD.
• Beta-blockers are the first-line treatment for LQTS.
• Implantable cardioverter-defibrillator (ICD) therapy is indicated for high-risk patients.

Conclusions:

• Genetic screening aids in diagnosing LQTS subtypes and guiding therapy.
• Treatment decisions for LQTS are based on individual SCD risk.
• Advanced therapies like cardiac pacing or left cardiac sympathetic denervation may be considered for specific high-risk LQTS patients.