不知为何，QT间期延长综合症患者可以许多年毫无症状，而后突然死于心停跳。

For unknown reasons, people with long QT syndrome can go without symptoms for years, and then suddenly drop dead from cardiac arrest.

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QT间期延长综合症会加速心跳，导致昏厥。

Long QT syndrome speeds up heartbeats, and can cause fainting.

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这些细胞最特别之处在于，它们来自于一位遗传性QT间期延长综合症患者。

What's particularly special about these cells is that they came from a patient with one of the inherited forms of long QT syndrome.

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