Serum potassium levels above 3.0 mEq/liter are not considered dangerous or of great concern; they can be treated with potassium replacement by mouth. Levels lower than 3.0 mEq/liter may require intravenous replacement. Decisions are patient-specific and depend upon the diagnosis, the circumstances of the illness, and the patient's ability to tolerate fluid and medication by mouth.
Over the short term, with self-limited illnesses like gastroenteritis with vomiting and diarrhea, the body is able to regulate and restore potassium levels on its own. However, if the hypokalemia is severe, or the losses of potassium are predicted to be ongoing, potassium replacement or supplementation may be required.
In those patients taking diuretics, often a small amount of oral potassium may be prescribed, since the loss will continue as long as the medication is prescribed. Oral supplements may be in pill or liquid form, and the dosages are measured in mEq. Common doses are 10-20 mEq per day. Alternatively, consumption of foods high in potassium may be suggested for replacement. Bananas, apricots, oranges, and tomatoes are high in potassium content. Since potassium is excreted in the kidney, blood tests that monitor kidney function may be ordered to predict and prevent potassium levels from rising too high.
When potassium needs to be given intravenously, it must be given slowly. Potassium is irritating to the vein and must be given at a rate of approximately 10 mEq per hour. As well, infusing potassium too quickly can cause heart irritation and promote potentially dangerous rhythms like ventricular tachycardia.
A Special Situation: Periodic Paralysis
Rarely, a special situation will occur when all the potassium in the body shifts from the serum into the cells of the body. This drops the serum potassium levels to 1.0 mEq/liter or lower. This causes immediate muscle weakness to the point that the patient cannot move. Arms and legs are most affected. Rarely, breathing and swallowing muscles can be involved.
Periodic paralysis may be hereditary and may be precipitated by excessive exercise, a high-carbohydrate or high-salt meal, or may occur without apparent cause.
Treatment by potassium replacement intravenously is effective, and recovery occurs within 24 hours.
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Archived: March 20, 2014
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Read the Original Article: Low Potassium (Hypokalemia)