In clinical practice, a blood potassium level greater than 5.5 millimoles per liter is referred to as hyperkalemia. Once hyperkalemia occurs, it must be actively managed: the first step is to stop using medications that increase blood potassium, such as sustained-release potassium chloride, potassium-sparing diuretics like spironolactone, and ACE inhibitors; the second step is to use calcium supplements to counteract the toxic effects of high potassium on the heart; the third step is to use hypertonic glucose with insulin and sodium bicarbonate to correct acidosis and promote the movement of potassium into the cells; the fourth step is to use the diuretic furosemide to help reduce blood potassium. If drug treatment is ineffective, bedside hemodialysis may be employed. (Use of the above medications should be under the guidance of a doctor.)