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Review Article
Hypernatremia and hyponatremia
Dong Un Kim
Clin Exp Pediatr. 2006;49(5):463-469.   Published online May 15, 2006
Sodium is the major cation of the extracellular fluid and the primary determinant of extracellular osmolality. Therefore, hypernatremia causes water movement out of cells, while hyponatremia causes water movement into cells, resulting in cellular shrinkage and cellular swelling, respectively. Serious central nervous system symptoms may complicate both conditions. Since hypernatremia and hyponatremia are accompanied by abnormalities in water balance, it...


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