[Preventive treatment of prolongation of the QT interval]

Area of Science:

• Cardiology
• Clinical Electrophysiology

Context:

• QT interval prolongation is a significant predictor of adverse cardiac events across diverse patient populations, including those with and without pre-existing heart disease.
• It is observed in numerous medical conditions and can manifest as a congenital or acquired electrocardiogram (ECG) anomaly.
• The prolonged QT interval is the hallmark symptom of long QT syndrome (LQTS).

Purpose:

• To elucidate the clinical significance of the QT interval in electrocardiography.
• To outline standardized measurement rules and address challenges in accurately assessing QT/QTc intervals.
• To discuss the etiologies of QT interval prolongation, encompassing congenital and acquired forms of long QT syndrome, and to review management strategies.

Summary:

• This review details the prognostic implications of QT interval prolongation in cardiology.
• It covers the diagnostic criteria, measurement techniques, and common causes of prolonged QT intervals.
• The paper also addresses the management of patients with QT prolongation and preventative measures for iatrogenic LQTS.

Impact:

• Improved understanding of QT interval prolongation aids in risk stratification and patient management.
• Accurate ECG interpretation can lead to earlier diagnosis and intervention for long QT syndrome.
• Knowledge of iatrogenic causes facilitates the prevention of drug-induced QT prolongation and associated arrhythmias.