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===Risk of QT prolongation===
===Risk of QT prolongation===
A prolonged QT interval can lead to arrhythmias such as [[Torsade de Pointes]] and subsequent [[Ventricular Fibrillation]]. The QT interval is prolonged in congenital [[long QT syndrome]], but QT prolongation can also occur as a consequence of (a.o.):
A prolonged QT interval can lead to arrhythmias such as [[Torsade de Pointes]] and subsequent [[Ventricular Fibrillation]].  
 
===Causes of QT prolongation===
The QT interval is prolonged in congenital [[long QT syndrome]], but QT prolongation can also occur as a consequence of (a.o.):
* medication (anti-arrhythmics, tricyclic antidepressants, phenothiazedes, for a complete list look on [http://www.torsades.org Torsades.org]  
* medication (anti-arrhythmics, tricyclic antidepressants, phenothiazedes, for a complete list look on [http://www.torsades.org Torsades.org]  
* electrolyte imbalances
* electrolyte imbalances