Fluid Management in Mild Renal Impairment

Risks and Complications

Normal saline can cause hyperchloremic metabolic acidosis, renal vasoconstriction, and acute kidney injury, particularly in patients with pre-existing renal impairment 3, 4
Patients with mild renal impairment are at higher risk for these complications due to their reduced ability to handle acid-base and electrolyte disturbances caused by high chloride content 2
The use of 0.9% saline is associated with a higher incidence of major adverse kidney events and metabolic complications compared to balanced crystalloids 4

Balanced crystalloids should be the first choice for patients with mild renal impairment requiring intravenous fluids to minimize the risk of hyperchloremic acidosis and renal injury 2, 3
If 0.9% saline must be used, it should be limited to a maximum of 1-1.5 L to minimize the risk of adverse effects 5
The Kidney Disease: Improving Global Outcomes (KDIGO) guidelines recommend using isotonic crystalloids rather than colloids for expansion of intravascular volume in patients at risk for AKI or with AKI 6

Buffered crystalloid solutions are strongly recommended over 0.9% saline in kidney transplant recipients due to the risk of delayed graft function 4
Recent evidence and guidelines from 2023-2024 have strengthened the recommendation for balanced crystalloids over normal saline 1, 2, 3
When administering intravenous fluids to patients with renal impairment, monitor serum electrolytes, acid-base status, urine output, daily fluid balance, and assess for signs of volume overload and renal function 2, 3, 4, 7