The following ECG findings suggest that recent syncope may be due to cardiac arrhythmias

  Acute myocardial infarction

  Old myocardial infarction

  Ventricular hypertrophy with frequent VPCs

  Sinus bradycardia

  Sinoatrial block or sinus pause longer than 3 seconds

  Long QT interval

  Short PR interval with delta wave

  High degree atrioventricular (AV) block

  Brugada syndrome

  Arrhythmogenic right ventricular dysplasia (negative T waves in C1-C3, epsilon waves)