在这多种原因中，一些会导致心跳失常，比如结构性心脏缺陷，这种异常的心律被称作。
For a variety of reasons, something - such as a structural heart defect - causes the heart to beat out of control. This abnormal heart rhythm is known as ventricular fibrillation.
心室复极延长，一种能引起心律失常的异常电传导。
Prolonged ventricular repolarization, an electrical conduction anomaly that could lead to heart rhythm abnormalities.
眩晕。心脏病发作可导致头晕，意识丧失。因此能潜在威胁的心律异常被称为心律失常。
Dizziness. Heart attacks can cause lightheadedness and loss of consciousness. So can potentially dangerous heart rhythm abnormalities known as arrhythmias.
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