High- and intermediate-risk factors for arrhythmia or sudden cardiac arrest in patients with Brugada syndrome or pattern

High-risk symptoms	Intermediate-risk factors
Sudden cardiac arrest Syncope Sustained ventricular tachycardia	Syncope that may be nonarrhythmic in origin* Family history of sudden cardiac arrest and/or Brugada syndrome Spontaneous type 1 ECG pattern Atrial fibrillation

* This symptom is the most concerning of the intermediate-risk factors.

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