Does Furosemide Increase Oxidative Stress in Acute Kidney Injury?

Area of Science:

• Nephrology
• Critical Care Medicine
• Oxidative Stress Research

Background:

• Furosemide is a loop diuretic commonly used to manage acute kidney injury (AKI).
• The clinical benefits of furosemide in AKI versus its potential harms remain unclear.
• Oxidative stress is implicated in AKI pathogenesis.

Purpose of the Study:

• To investigate the effect of furosemide on oxidative stress in critically ill patients with AKI.
• To determine if furosemide administration influences levels of F2-isoprostanes (F2-IsoPs), a marker of oxidative stress.

Main Methods:

• Measured plasma and urine F2-IsoPs in 30 critically ill AKI patients before and after intravenous furosemide.
• Analyzed F2-IsoP changes in relation to AKI severity, sepsis, and furosemide dosage.

Main Results:

• Urine F2-IsoPs were elevated in sepsis and increased with higher urine furosemide levels.
• The furosemide-induced rise in urine F2-IsoPs varied significantly with AKI severity, being highest in the most severe cases.
• Furosemide did not affect plasma F2-IsoP levels.

Conclusions:

• Furosemide administration increases renal oxidative stress in AKI patients.
• The most severe AKI cases, likely receiving higher furosemide doses, exhibited the greatest increase in oxidative stress.
• High-dose furosemide to convert oliguric to nonoliguric AKI may induce detrimental renal oxidative stress, necessitating randomized controlled trials to balance benefits and harms.