Bihotzeko QT sindrome luzea, hERG kanaleko mutazioekin lotutako kanalopatia
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BEATRIZ SAENZ-DIEZ MONICA GALLEGO
OSCAR CASIS
Abstract
The KCNH2 gene encodes for the KV11.1 or hERG channel that mediates the IKr potassium current. This current is essential for ventricular repolarization in humans and, therefore, for proper cardiac function. Mutations in this gene can produce modified hERG channels, leading to a reduction in the IKr current. This reduction in IKr current causes an increase in the duration of cardiac repolarization and, therefore, an increase in the QT interval, as can be seen on the electrocardiogram. This prolongation of the QT interval leads to a cardiac pathology called long QT syndrome type 2, which increases the risk of serious, even fatal, arrhythmias.
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