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Treatment of hypernatremia in an acidotic neonatal calf.

Angelos Sm,Bradford P. Smith,Lisle W. George,John K. House,Van Metre Dc,Gilles Fecteau,Thacker Vc,J. Angelos

Published 1999 in Journal of the American Veterinary Medical Association

ABSTRACT

A 7-day-old Jersey calf was evaluated because of diarrhea and pneumonia. The calf was hypernatremic, hypoproteinemic, and acidemic, and was treated initially with i.v. administration of fluids with sodium concentration (175 mEq/L) similar to the calf's serum sodium concentration. Sodium concentration of the administered fluids was gradually decreased over the following days, but the calf's serum sodium concentration decreased too rapidly, and the calf developed neurologic signs attributed to cerebral edema. Treatment with mannitol and i.v. administration of fluids with a higher concentration of sodium resulted in abatement of clinical signs. In calves, hypernatremia may develop over several days. Prescribing traditional isotonic or hypotonic fluids in such cases will be harmful, because during chronic hypernatremia, the brain's adaptive mechanisms involve accumulation of organic osmoles that may take several days to equilibrate across cell membranes, and cerebral edema may result. Administration of fluids containing sodium concentration approximately equal to the patient's measured serum sodium concentration is required to decrease serum sodium concentration more slowly than is possible with traditional isotonic fluids.

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