ECG characteristics:

Etiology:

• Congenital: Genetic defect of the voltage-dependent potassium or sodium channels (total of five different types)
  
• Acquired: Medication or ischemia

ECG characteristics:

• Prolongation of the QT interval Ventricular apical changes
  
• Occurrence of U waves
  
• Malignant ventricular arrhythmias (Torsade de pointes)

Treatment:

• Because the trigger of the ventricular arrhythmias is sympathetic activation → beta-blocker sympathetic blockade (stellate ganglion)
  
• ICD implantation