Hyponatremia is an electrolyte imbalance in which the sodium ion concentration in the plasma is lower than normal. Normal serum sodium levels are between approximately 135 and 145 mEq/L. Hyponatremia is generally defined as a serum level of less than 135 mEq/L. Shown on the left is a normal brain. On the right,serum sodium ion level is less than 130 mEq/L and water is drawn into the cells,causing the brain to swell | |
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