<unk>  is a rare, inherited arrhythmic disorder causing an increased risk of syncope and sudden death due to ventricular fibrillation.
Consider as cause of syncope in patients with family history of sudden death
80% of<unk>  diagnosed only after a cardiac arrest
Autosomal dominant Na-channelopathy which increases the risk of sudden cardiac death (~10%/yr)
Much more common in men (up to 9x), particularly Southeast Asian males
ECG shows incomplete RBBB with ST elevation in V1-V3
In uncomplicated RBBB, usually there is no ST change to slight ST depression
If presenting symptom is chest pain rather than syncope, consider strongly STEMI
In uncomplicated RBBB, usually there is no ST change to slight ST depression
If presenting symptom is chest pain rather than syncope, consider strongly STEMI
Brugada syndrome
Cardiac
Vincent's angina
ST-segment elevation myocardial infarction 
Torsades de pointes
Post-MI 
Takotsubo cardiomyopathy
Previous MI with recurrent ischemia in same area