Which statement best explains the rationale for fluid restriction in oliguric acute renal failure?

• A. To prevent volume overload and edema
• B. To increase urine output
• C. To improve appetite
• D. To improve electrolyte excretion

Answer: (A)

In oliguria during acute renal failure, the kidneys aren’t able to remove water effectively, so any fluid you take in tends to stay in the body. Fluid restriction aims to prevent volume overload, which can lead to edema, high blood pressure, and dangerous fluid buildup in the lungs. By limiting intake to what the body can safely handle (accounting for urine output and insensible losses), you reduce the risk of these complications while the kidneys recover.

Other options don’t fit this goal. Restricting fluids doesn’t actively increase urine output, and appetite isn’t the issue in this context. Simply restricting fluids also doesn’t directly improve electrolyte excretion; managing electrolytes requires addressing the underlying kidney injury and may involve other treatments.