Genotype of disorders causing cardiac sudden death syndrome identified

Researchers in Spain have identified the most frequent mutations in the gene KCNH2 in patients with long QT syndrome -- a disorder of cardiac ionic channels that approximately affects one in every 2,500 people and may cause torsade de pointes episodes, which can trigger sudden death. This condition usually affects children and adolescents, and it is occasionally mistaken for convulsions, leading to a misdiagnosis of epilepsy.

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