Intracellular - 98%

Extracellular - 2% - in intravascular space and interstitial space

K levels affected by:

• Intake (dietry, drugs)
• Uptake into cells
• Renal excretion
• Extrarenal issues (GI)

Hypokalaemia

Hyperkalaemia

Cardiac complications

<2.5 = asystole

6.5 = Ventricular fibrillation