Why must LR be used with caution in patients with renal impairment?

• A. LR contains potassium and calcium; electrolyte balance may be affected; in renal impairment, prefer NS unless otherwise indicated.
• B. LR contains only sodium; always safe in renal impairment.
• C. LR has no electrolytes; LN is better.
• D. LR is contraindicated in all cases.

Answer: (A)

The main idea is that the electrolyte content of lactated Ringer's solution can pose risks when the kidneys aren’t functioning well. LR contains potassium and calcium. In renal impairment, the body’s ability to excrete potassium is reduced, so giving LR can raise potassium levels (hyperkalemia), which can affect heart rhythm. The calcium in LR adds another load that can complicate calcium balance, especially in conditions like CKD where managing calcium and phosphate is delicate. Because of these concerns, normal saline (which has no potassium or calcium) is often preferred unless there’s a specific reason to use LR, such as a need for lactate buffering or other clinical indications.