Long Qt Syndrome 11 (LQT11)

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GARD: ¹⁹ Long QT syndrome (LQTS) is a cardiac electrophysiologic disorder, characterized by QT prolongation and T-wave abnormalities on the ECG that are associated with tachyarrhythmias, typically the ventricular tachycardia torsade de pointes (TdP). TdP is usually self-terminating, thus causing a syncopal event, the most common symptom in individuals with LQTS. Such cardiac events typically occur during exercise and emotional stress, less frequently during sleep, and usually without warning. In some instances, TdP degenerates to ventricular fibrillation and causes aborted cardiac arrest (if the individual is defibrillated) or sudden death. Approximately 50% of untreated individuals with a pathogenic variant in one of the genes associated with LQTS have symptoms, usually one to a few syncopal events. While cardiac events may occur from infancy through middle age, they are most common from the preteen years through the 20s. Some types of LQTS are associated with a phenotype extending beyond cardiac arrhythmia. In addition to the prolonged QT interval, associations include muscle weakness and facial dysmorphism in Andersen-Tawil syndrome (LQTS type 7); hand/foot, facial, and neurodevelopmental features in Timothy syndrome (LQTS type 8); and profound sensorineural hearing loss in Jervell and Lange-Nielson syndrome.

MalaCards based summary: Long Qt Syndrome 11, also known as lqt11, is related to familial long qt syndrome and cardiomyopathy, familial hypertrophic, 4, and has symptoms including syncope An important gene associated with Long Qt Syndrome 11 is AKAP9 (A-Kinase Anchoring Protein 9), and among its related pathways/superpathways are Cardiac conduction and Dopamine-DARPP32 Feedback onto cAMP Pathway. Affiliated tissues include heart, and related phenotypes are syncope and prolonged qtc interval

OMIM®: ⁵⁷ Congenital long QT syndrome is electrocardiographically characterized by a prolonged QT interval and polymorphic ventricular arrhythmias (torsade de pointes). These cardiac arrhythmias may result in recurrent syncope, seizure, or sudden death (Jongbloed et al., 1999). (611820) (Updated 08-Dec-2022)

UniProtKB/Swiss-Prot: ⁷³ A heart disorder characterized by a prolonged QT interval on the ECG and polymorphic ventricular arrhythmias. They cause syncope and sudden death in response to exercise or emotional stress, and can present with a sentinel event of sudden cardiac death in infancy.

Disease Ontology: ¹¹ A long QT syndrome that has material basis in dominant inheritance of mutation in the AKAP9 gene on chromosome 7q21.2.

Clinical features from OMIM®:

Search Clinical Trials, NIH Clinical Center for Long Qt Syndrome 11