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Urinary strong ion difference is a major determinant of plasma chloride concentration changes in postoperative patients


, : Urinary strong ion difference is a major determinant of plasma chloride concentration changes in postoperative patients. Revista Brasileira de Terapia Intensiva 25(3): 197-204

To show that alterations in the plasma chloride concentration ([Cl-]plasma) during the postoperative period are largely dependent on the urinary strong ion difference ([SID]urine=[Na+]urine+[K+]urine-[Cl-]urine) and not on differences in fluid therapy. Measurements were performed at intensive care unit admission and 24 hours later in a total of 148 postoperative patients. Patients were assigned into one of three groups according to the change in [Cl-]plasma at the 24 hours time point: increased [Cl-]plasma (n=39), decreased [Cl-]plasma (n=56) or unchanged [Cl-]plasma (n=53). On admission, the increased [Cl-]plasma group had a lower [Cl-]plasma (105 ± 5 versus 109 ± 4 and 106 ± 3 mmol/L, p<0.05), a higher plasma anion gap concentration ([AG]plasma) and a higher strong ion gap concentration ([SIG]). After 24 hours, the increased [Cl-]plasma group showed a higher [Cl-]plasma (111 ± 4 versus 104 ± 4 and 107 ± 3 mmol/L, p<0.05) and lower [AG]plasma and [SIG]. The volume and [SID] of administered fluids were similar between groups except that the [SID]urine was higher (38 ± 37 versus 18 ± 22 and 23 ± 18 mmol/L, p<0.05) in the increased [Cl-]plasma group at the 24 hours time point. A multiple linear regression analysis showed that the [Cl-]plasma on admission and [SID]urine were independent predictors of the variation in [Cl-]plasma 24 hours later. Changes in [Cl-]plasma during the first postoperative day were largely related to [SID]urine and [Cl-]plasma on admission and not to the characteristics of the infused fluids. Therefore, decreasing [SID]urine could be a major mechanism for preventing the development of saline-induced hyperchloremia.

US$19.90

PMID: 24213082

DOI: 10.5935/0103-507X.20130035


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