Please tell me what can high potassium level in blood cause?

Hyperkalemia effects: High blood potassium levels, hyperkalemia, (h) can lead to abnormal heart rhythms. Moderate h can produce ekg changes (ekg is an electrical reading of the heart muscles). Severe h can cause suppression of electrical activity of the heart and can cause the heart to stop beating. H can also cause muscle weakness or paralysis in severe cases. If you have h, see a nephrologist for a diagnosis and cure.