Brugada syndrome is diagnosed when there are characteristic EKG changes associated with one of the following:
- documented ventricular fibrillation
- polymorphic ventricular tachycardia
- family history of sudden cardiac death at age less than 45 years old
- inducibility of VT with programed electrical stimulation
Source
Kass, R. and Clancy, C. Basis and Treatment of Cardiac Arrhythmias. 2006.