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28.03.2024 | Original Article

Effect of a single small volume fluid bolus with balanced or un-balanced fluids on chloride and acid–base status: a prospective randomized pilot study (the FLURES-trial)

verfasst von: M. Raes, J. A. Kellum, R. Colman, S. Wallaert, M. Crivits, F. Viaene, M. Hemeryck, D. Benoit, J. Poelaert, E. Hoste

Erschienen in: Journal of Nephrology

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Abstract

Objective

To compare the short-term effects on acid base, electrolyte status and urine output of a single fluid bolus of saline to that of the balanced solution Plasmalyte^® in critically ill patients.

Methods

Prospective, randomized, controlled trial. Adult patients (≥ 18 years) admitted to the ICU receiving a fluid bolus were randomized to receive 1 L of saline (NaCl 0.9%, Baxter) or a balanced fluid [Plasmalyte^® (Baxter)]. Blood samples and urine output were collected just before (T0), just after (T1), 2 h after (T2) (only for urinary output) and three hours after termination of the fluid bolus (T4). The effect of fluid boluses on serum chloride, apparent strong ion difference, base excess, urinary output and blood pressure or vasopressor need were analyzed.

Main results

Patients who received a 1 L saline fluid bolus had a significant increase in serum chloride (1.60; 95% CI 1.10 to 2.10; P < 0.001) and short-term decrease in apparent strong ion difference (− 1.85; 95% CI − 2.71 to − 0.99; P < 0.001) and base excess (− 0.90; 95% CI − 1.31 to − 0.50; P < 0.001). We observed a 17% increase in patients developing hyperchloremia in the saline group (0.17; 95% CI 0.05 to 0.29; P = 0.005). No significant difference in urinary output, blood pressure or vasopressor need was observed in either group.

Conclusion

Even a single, small bolus of saline, administered to critically ill patients, causes a significant increase in chloride concentration and a decrease in apparent strong ion difference and base excess, and an increase in the number of patients developing hyperchloremia. No difference in effect on urinary output, blood pressure or vasopressor need was observed between the two groups.

EudraCT number

2014-001005-41; date of registration: 28/10/2014.

Local EC approval

EC project number 2014/038.

Graphical abstract

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Titel: Effect of a single small volume fluid bolus with balanced or un-balanced fluids on chloride and acid–base status: a prospective randomized pilot study (the FLURES-trial)
verfasst von: M. Raes
J. A. Kellum
R. Colman
S. Wallaert
M. Crivits
F. Viaene
M. Hemeryck
D. Benoit
J. Poelaert
E. Hoste
Publikationsdatum: 28.03.2024
Verlag: Springer International Publishing
Erschienen in: Journal of Nephrology
Print ISSN: 1121-8428
Elektronische ISSN: 1724-6059
DOI: https://doi.org/10.1007/s40620-024-01912-z

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