Clinical Characteristics and Outcomes of Pediatric Patients With Long QT Syndrome: A Korean Multicenter Cohort Study.

This multicenter Korean cohort demonstrates genotype-phenotype patterns and highlights the contribution of fetal arrhythmia, female sex, QTc, and beta-blocker use to arrhythmic risk stratification in pediatric long QT syndrome.

These results support early diagnosis and genotype- and phenotype-guided management and highlight the need for international studies to refine risk stratification in diverse populations.