Certain combinations of electrolyte abnormalities are encountered with some frequency, especially in patients with renal failure.
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Abnormality #1
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Abnormality #2
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ECG Change
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hypocalcemia
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hyperkalemia
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ST segment prolongation and tented T waves; increased risk of major ventricular arrhythmias
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hypercalcemia
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hyperkalemia
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impact on ventricular arrhythmias tends to be cancelled out
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hypernatremia
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hyperkalemia
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decreased potassium-related effects
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hyponatremia
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hyperkalemia
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increased potassium-related effects
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hypermagnesemia
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hyperkalemia
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increased potassium-related effects
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