Evidence‑Based Fluid Management in Acute Kidney Injury

Fluid Choice for Volume Expansion

Isotonic crystalloids are recommended as the first‑line therapy for intravascular volume expansion in patients at risk for or with established AKI (excluding hemorrhagic shock). This recommendation is based on multiple guideline statements. [1][2]
Starch‑containing colloid solutions should be avoided completely because they increase the risk of AKI and cause harm. Strong evidence from guideline panels supports this avoidance. [1][2]3
Balanced crystalloid solutions (e.g., lactated Ringer’s, Plasma‑Lyte) appear to be superior to 0.9 % saline for renal outcomes, although the optimal choice between balanced solutions and normal saline remains under investigation. [4][5]
Albumin should be used only for specific indications such as patients with liver disease and spontaneous bacterial peritonitis, large‑volume paracentesis, or as part of hepatorenal‑syndrome diagnostic criteria. Outside these contexts, albumin is not recommended. [1][2]3
Albumin is contraindicated in patients with traumatic brain injury because it has been associated with adverse outcomes. [1][2]3

Vasopressors should be employed together with fluids in patients with vasomotor shock who have, or are at risk for, AKI. This combined approach is endorsed by guideline committees. [1][2]3
Protocol‑driven management of hemodynamic and oxygenation parameters in high‑risk peri‑operative patients and those with septic shock is recommended to prevent the development or worsening of AKI. [1][2]3

Diuretics must NOT be used to prevent AKI (strong recommendation). Evidence indicates no preventive benefit and potential harm. [1][2][3][6]
Diuretics are appropriate only for treating established volume overload in patients with AKI, not as a therapy for AKI itself. [1][2][3][6]
A protocolized diuretic‑based fluid removal strategy is recommended over usual care in critically ill patients after acute resuscitation, provided the patient has sufficient residual kidney function to respond. 7
When true volume overload exists, successful decongestion with diuretics can improve kidney function, despite concerns about diuretic‑associated AKI in hypovolemic patients. 7
If diuretics are ineffective because of poor kidney function, hypoalbuminemia, or diuretic resistance, ultrafiltration or renal replacement therapy (RRT) should be considered for fluid removal. 7
Routine ultrafiltration without an additional indication for RRT is NOT recommended after the acute resuscitation phase. 7

Low‑dose dopamine should NOT be used to prevent or treat AKI (strong recommendation). [1][2][3][6]
Fenoldopam is not recommended for AKI prevention or treatment. [1][2][3][6]
Atrial natriuretic peptide (ANP) should not be employed to prevent or treat AKI. [1][2][3][6]
Recombinant human IGF‑1 is not indicated for AKI prevention or treatment. [1][2][3][6]

Positive cumulative fluid balance in patients with AKI is associated with higher mortality and longer AKI duration; excess fluid accumulation correlates with worse renal and survival outcomes. 6
Inappropriate use of diuretics can cause volume depletion and hypotension, potentially worsening renal hypoperfusion in patients without true volume overload. 6