Fluid and Electrolyte Danger Patterns

This lesson teaches two anchor patterns, hyperkalemia and acute symptomatic hyponatremia; other danger patterns (hypokalemia and IV potassium safety, calcium, magnesium, and fluid volume imbalance) are taught in their own lessons. An abnormal electrolyte value becomes dangerous when it disrupts excitable tissue, brain function, or circulation, and danger can increase faster than the number suggests. This lesson uses hyperkalemia and acute symptomatic hyponatremia as anchor patterns. Excess potassium primarily threatens cardiac conduction and muscle strength; a rapid or severe sodium fall draws water into brain cells and can produce neurologic injury. The nurse's task is not to wait for collapse: recognize the pattern, assess immediate threats, obtain an ECG and serial laboratory data, give ordered emergency therapy, and reassess the response. The potassium or sodium result, rate of change, symptoms, renal function, urine output, and medication history must be interpreted together.