Utility of Treadmill Testing in Identification and Genotype Prediction in Long-QT Syndrome

BACKGROUND: The clinical diagnosis of long-QT syndrome (LQTS) remains challenging when ECG abnormalities are borderline or intermittent. Despite issues with access, cost, and heterogeneity of LQTS mutations, genetic testing remains the diagnostic gold standard for diagnosis of LQTS. We sought to develop a provocative testing strategy to unmask the LQTS phenotype and relate this to the results of genetic testing. METHODS AND RESULTS: From 1995 …