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In approximately 10–20% of all sudden deaths, no structural cardiac abnormalities can be identified. Important potential causes of sudden cardiac deaths in the absence of heart disease are primary electrical diseases such as Brugada syndrome, long QT syndrome (LQTS), short QT syndrome (SQTS), and catecholaminergic polymorphic ventricular tachyarrhythmias (CPVT). The resting ECG and the ECG under...
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