While normal saline is generally the favored fluid for volume expansion, use of this fluid in patients with hypvolemic hyponatremia has lead to central pontine myelinolysis. Consider use of 1/2 NS or alternating NS with 1/2 NS. No matter what, closely monitor Na.
Source
Oh, M. et al. "Case Report: Danger of Central Pontine Myelinolysis in Hypotonic Dehydration and Recommendation for Treatment" American Journal of the Medical Sciences. July 1989.
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