ECG changes in hypokalaemia

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Hypokalaemia can cause:

  • flattened T waves
  • ST segment depression
  • prolonged QT interval
  • tall U waves
  • atrial arrythmias
  • ventricular tachycardia or ventricular fibrillation and torsade de pointes.


  • ECG changes seen in hypokalaemia is not reliable since some severe hypokalaemic patients may not exhibit these changes (1)

Click here for an example ECG and further information


Last edited 02/2018 and last reviewed 07/2021