Hypokalemia and hyperkalemia can both trigger either sustained or nonsustained episodes of ventricular tachycardia / ventricular fibrillation and serum electrolytes should therefore be checked.  Both alcohol and cocaine intoxication can be associated with either sustained or nonsustained episodes of ventricular tachycardia/ventricular fibrillation and a toxicology  screen should be ordered if there is a clinical suspicion. Likewise, tricyclic antidepressants can be associated with exacerbations of the syndrome, and levels of these agents should also be checked if there is a clinical suspicion.
Brugada syndrome laboratory findings
Brugada syndrome physical examination
Guillain-Barré syndrome electrocardiogram
Brugada syndrome diagnostic criteria
Brugada syndrome classification
Torsades de pointes laboratory findings
Pulseless electrical activity laboratory findings
Short QT syndrome laboratory findings