Generally presents between 7-9yo, uncommon to present before 2yo
Often with family history of known<unk>  or sudden unexplained death
Polymorphic ventricular<unk>  --> syncope/presyncope, palpitations, death
PVT induced by:
Exercise
Emotional stress
Any other cause of increased catecholamines (e.g. drugs, physiologic stressors)
Exercise
Emotional stress
Any other cause of increased catecholamines (e.g. drugs, physiologic stressors)
Catecholaminergic polymorphic ventricular tachycardia
Seizure
Idiopathic fascicular left ventricular tachycardia
Toxicologic exposure 
Wandering atrial pacemaker
CO poisoning 
Polymorphic ventricular tachycardia
Breath-holding spell