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Should we use diuretics in acute renal failure?
1Department of Intensive Care Medicine, University Hospital Gasthuisberg, Herestraat 49, Leuven 3000, Belgium. marie.schetz@uz.kuleuven.ac.be
Best Practice & Research. Clinical Anaesthesiology
|February 6, 2004
Summary
Loop diuretics do not improve kidney function in acute renal failure (ARF) and may even be harmful. While they increase urine output in ARF patients, a renoprotective effect remains unproven, with mannitol showing limited benefit in transplantation.
Area of Science:
- Nephrology
- Critical Care Medicine
- Pharmacology
Background:
- Oliguria is a negative prognostic indicator in acute renal failure (ARF).
- Diuretics are commonly administered to increase urine output in ARF patients.
- Pathophysiological rationale suggests loop diuretics might benefit renal function.
Purpose of the Study:
- To evaluate the efficacy of loop diuretics in improving renal function in patients with or at risk of ARF.
- To assess the impact of loop diuretics on urine output and kidney function parameters.
- To review evidence for renoprotective effects of diuretics, including mannitol.
Main Methods:
- Review of clinical trials on the prophylactic and therapeutic use of loop diuretics in ARF.
- Analysis of studies investigating the effect of diuretics on urine output and renal function parameters.
- Examination of evidence for mannitol's renoprotective effects, particularly in renal transplantation.
Main Results:
- Prophylactic use of loop diuretics may have a deleterious effect on kidney function.
- In established ARF, loop diuretics increase urine output, aiding patient management.
- A beneficial effect of loop diuretics on renal function in ARF has not been demonstrated, though not entirely excluded due to study limitations.
Conclusions:
- Current evidence does not support a renoprotective effect of loop diuretics in ARF.
- Increased urine output from loop diuretics in ARF primarily facilitates management, not renal recovery.
- Further high-powered studies are needed to definitively assess potential renoprotective effects, and mannitol's benefit is limited to renal transplantation.