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Hyperkalemia

High concentrations of potassium in the blood.

Elevated serum potassium that can disrupt cardiac and skeletal muscle excitability. Causes include renal failure, acidosis, and certain medications.

How one textbook covers it

Advanced Nutrition and Human Metabolism, 8th ed. (Gropper) — Glossary
Elevated serum potassium that can disrupt cardiac and skeletal muscle excitability. Causes include renal failure, acidosis, and certain medications.

Hypokalemia