Potassium

Potassium is an electrolyte symbolized with the letter K. When potassium is low, everyone freaks out; a condition called hypokalemia. When potassium is high, everyone freaks out again; a condition called hyperkalemia. Hyperkalemia can cause life-threatening arrhythmia in both patients (by affecting depolarization) and health care providers (by scaring the bejeezus out of them).

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