• Journal of critical care · Oct 2021

    Early ICU-acquired hypernatraemia is associated with injury severity and preceded by reduced renal sodium and chloride excretion in polytrauma patients.

    • Christopher Rugg, Mirjam Bachler, Simon Mösenbacher, Elena Wiewiora, Stefan Schmid, Janett Kreutziger, and Mathias Ströhle.
    • Department of Anaesthesiology and Critical Care Medicine, Medical University of Innsbruck, Anichstrasse 35, 6020 Innsbruck, Austria. Electronic address: christopher.rugg@tirol-kliniken.at.
    • J Crit Care. 2021 Oct 1; 65: 9-17.

    PurposeTo further elucidate the origin of early ICU-acquired hypernatraemia.Material And MethodsIn this retrospective single-centre study, polytrauma patients requiring ICU treatment were analysed.ResultsForty-eight (47.5%) of 101 included polytrauma patients developed hypernatraemia within the first 7 days on ICU. They were more severely ill as described by higher SAPS III, ISS, daily SOFA scores and initial norepinephrine requirements as well as longer requirements of mechanical ventilation and ICU treatment in general. The development of hypernatraemia was neither attributable to fluid- or sodium-balances nor renal impairment. Although lower in the hypernatraemic group from day 4 onwards, median creatinine clearances were sufficiently high throughout the observation period. However, in the hypernatraemic group, urine sodium and chloride concentrations prior to the evolvement of hypernatraemia (56 (27-87) mmol/l and 39 (23-77) mmol/l) were significantly decreased when compared to i) the time after developing hypernatraemia (94 (58-134) mmol/l and 78 (36-115) mmol/l; p < 0.001) and ii) the non-hypernatraemic group in general (101 (66-143) mmol/l and 75 (47-109) mmol/l; p < 0.001).ConclusionsEarly ICU-acquired hypernatraemia is associated with injury severity and preceded by reduced renal sodium and chloride excretion in polytrauma patients.Copyright © 2021 Elsevier Inc. All rights reserved.

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