Hyponatremia after hip arthroplasty may not be related to a positive EFW balance. The postoperative increase of the OG(p) and the greater postoperative OG(u) in patients developing postoperative hyponatremia suggest the release of osmotically active solutes leading to cellular water shift from intracellular to extracellular spaces. These data may support the clinical relevance of the sick cell syndrome in the postoperative context.
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