Sex differences in long QT syndrome

Area of Science:

• Cardiology
• Genetics
• Electrophysiology

Background:

• Long QT Syndrome (LQTS) is a rare inherited channelopathy causing cardiac repolarization dysfunction.
• LQTS increases the risk of malignant ventricular tachyarrhythmias, syncope, and sudden cardiac death.
• Diagnosis is challenging due to complex genetics, variable expressivity, and incomplete penetrance.

Purpose of the Study:

• To review current understanding of LQTS, focusing on risk stratification.
• To highlight the underrepresentation of sex-related data in LQTS research.
• To emphasize the increased risk of malignant arrhythmias in females with LQTS.

Main Methods:

• Literature review of recent advancements in LQTS diagnosis and treatment.
• Analysis of factors contributing to risk stratification, including sex, age, QTc interval, and genetics.
• Focus on sex-specific differences in LQTS, particularly post-puberty hormonal influences.

Main Results:

• Despite advancements, risk stratification in LQTS remains a challenge.
• Female sex is an emerging risk factor for malignant arrhythmias in LQTS, influenced by hormonal changes after puberty.
• Less than 10% of LQTS publications include sex-related data on malignant arrhythmia risk in females.

Conclusions:

• Sex is a significant, yet understudied, factor in LQTS risk stratification.
• Further research incorporating sex-specific data is crucial for personalized treatment of LQTS patients.
• Addressing the data gap regarding female LQTS patients is essential for improving outcomes and reducing sudden cardiac death risk.