Polymorphic VT (Torsades de Pointes ... This is present in only a small percentage of VT ECG tracings, but it is diagnostic of VT. Frequently, this is difficult to see due to the fast rate ...

Catecholaminergic Polymorphic Ventricular Tachycardia (CPVT ... or cardiac arrest during exercise or emotional upset. The ECG would show a wide-complex QRS with a ventricular rate of at least ...