Demographic Variations in Long QT Syndrome: Analyzing the Impact of Gender, Ethnicity, and Environmental Factors on Prevalence and Risk

Long QT syndrome (LQTS) is an arrhythmic condition characterized by delayed repolarization of cardiomyocytes, identified by prolonged QT interval on an electrocardiogram (ECG). LQTS can be caused by congenital mutations of ion channels or acquired through conditions, medications, and environmental factors. Prolongation of the QT interval can trigger deadly arrhythmia including torsade de pointes (TdP). LQTS has been named the top cause of sudden cardiac death (SCD) for young individuals with anatomically normal hearts. The incidence of LQTS has been reported to be between 1:2000 and 1:2500. The demographic differences in LQTS prevalence have not been thoroughly researched. The incidence and penetrance of LQTS mutations differ between ethnic groups, and outcomes for patients are based on genetics and environmental factors. The risk for cardiac events has been found to be higher in women than men, at least in part due to the effect of sex hormones on the heart, although the mechanisms are not fully understood. A fuller understanding of sex and ethnicity will contribute to a more comprehensive knowledge of the disease and guide the future of LQTS research.