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Long QT Syndrome (inherited heart condition)

An abnormality in the heart rhythm. The long QT syndrome is sometimes inherited. The following conditions can also cause this disorder: certain medications (erythromycin, moxifloxacin, terfenadine), abnormal blood chemistry (low potassium, low calcium, or low magnesium), heart attacks, cocaine abuse, and stroke. The disease gets its name from certain waves, called Q and T, that show up on an EKG: the interval between the Q wave and the T wave is prolonged. This abnormality can lead to lethal heart rhythms such as ventricular tachycardia and Torsades de pointes, in which the heart stops beating effectively. If untreated, it can result in unexplained fainting (syncope) and death. Once found in a family member, other relatives may need to be tested for the disorder.
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