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.
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.
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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