Key Points
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In patients who are critically ill, adequate resuscitation of shock and the need to mitigate the harmful effects of fluid overload must both be considered
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Patients developing acute kidney injury (AKI) are at particular risk of fluid overload
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Fluid overload is associated with adverse clinical outcomes and might also directly contribute to the persistence of AKI
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Optimal fluid management in critical illness and AKI might involve early, targeted resuscitation, followed by active management of an even fluid balance and, finally, an appropriate rate of fluid removal
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In AKI, renal replacement therapy might be indicated for fluid balance management before conventional indications
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To obtain best clinical outcomes, serial fluid status assessment and careful definition of cardiovascular and renal targets will be required throughout critical illness
Abstract
In patients with acute kidney injury (AKI), optimization of systemic haemodynamics is central to the clinical management. However, considerable debate exists regarding the efficacy, nature, extent and duration of fluid resuscitation, particularly when the patient has undergone major surgery or is in septic shock. Crucially, volume resuscitation might be required to maintain or restore cardiac output. However, resultant fluid accumulation and tissue oedema can substantially contribute to ongoing organ dysfunction and, particularly in patients developing AKI, serious clinical consequences. In this Review, we discuss the conflict between the desire to achieve adequate resuscitation of shock and the need to mitigate the harmful effects of fluid overload. In patients with AKI, limiting and resolving fluid overload might prompt earlier use of renal replacement therapy. However, rapid or early excessive fluid removal with diuretics or extracorporeal therapy might lead to hypovolaemia and recurrent renal injury. Optimal management might involve a period of guided fluid resuscitation, followed by management of an even fluid balance and, finally, an appropriate rate of fluid removal. To obtain best clinical outcomes, serial fluid status assessment and careful definition of cardiovascular and renal targets will be required during fluid resuscitation and removal.
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Prowle, J., Kirwan, C. & Bellomo, R. Fluid management for the prevention and attenuation of acute kidney injury. Nat Rev Nephrol 10, 37–47 (2014). https://doi.org/10.1038/nrneph.2013.232
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DOI: https://doi.org/10.1038/nrneph.2013.232
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