Symptoms and Arrhythmias

Patients with hyperkalaemia frequently appear well. In severe cases they can have these non-specific symptoms:

  • Lethargy, confusion, weakness
  • Palpitations
  • Flaccid paralysis
  • Paraesthesia

The whole spectrum of arrhythmias can occur, including ventricular tachycardia and ventricular fibrillation.

Hyperkalaemic cardiac arrest is almost always fatal unless potassium levels are reduced during resuscitation.