**Insulin is used to correct hyperkalaemia.**

  *Hyperkalaemia is increased plasma potassium level above normal range in extracellular fluid. There is increased membrane excitability, which leads to ventricular arrhythmia and ventricular fibrillation.
  *Administration of iv insulin activates Na+- K+ ATPase pump and causes redistribution of K+ from extracellular into the cells by Na+-K+ ATPase pump.
  This pump moves:
     *3 Na⁺ out of the cell
     *2 K⁺ into the cell
    *Potassium shifts from extracellular fluid (plasma) into cells, lowering serum K⁺.
Thus is used to correct hyperkalaemia