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Hyperkalemia is a relatively common disturbance of electrolytes. Most cases of hyperkalemia are mild and may not produce any symptoms at all. Typically, hyperkalemia that develops slowly over time produces fewer symptoms than a sudden rise in potassium levels.
Usually, symptoms do not become apparent until potassium levels are very high (7.0 mEq/l or greater). Sometimes people with hyperkalemia report nonspecific symptoms such as muscle weakness, tiredness, tingling sensations, or nausea.
A slow heartbeat and weak pulse are more serious symptoms, since these may signal an effect on the electrical activity of the heart. Potassium is responsible for maintaining normal heart rhythm and hyperkalemia can have potentially life-threatening effects. While mild hyperkalemia probably has a limited effect on the heart, moderate hyperkalemia can changes in the electrocardiogram (EKG, ECG) recording (EKG is an electrical reading of the activity of the neuromuscular activity of the heart), and severe hyperkalemia can cause the heart to stop beating.
Hyperkalemic periodic paralysis is a rare inherited disorder that can result in sudden hyperkalemia accompanied by muscle paralysis.
Medically Reviewed by a Doctor on 7/24/2014
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