Five variants of<unk>  QT syndrome have been characterized based upon the underlying genetic mutation, the electrocardiographic phenotype, and the clinical manifestations of the variant. The different genes which are mutated are KCNH 2 gene for SQTS 1 which causes upregulation of Ikr channel, KCNQ 1 for SQT 2 which upregulates IKs, KCNJ 2 gene for SQTS 3 which causes upregulation of alpha subunit of IK1, CACNA1C for SQTS 4 which causes downregulation of ICa and CACNB2b, for SQTS 5 which also causes downregulation of Ica.
Short QT syndrome classification
Long QT Syndrome classification
Long QT Syndrome risk stratification
Brugada syndrome classification
Stress cardiomyopathy classification
Haff disease electrocardiogram
Cardiomyopathy classification
Hypertrophic cardiomyopathy classification