Course of gentamicin nephrotoxicity

Area of Science:

• Nephrology
• Pharmacology
• Toxicology

Background:

• Gentamicin is an aminoglycoside antibiotic with known nephrotoxic potential.
• Understanding the time course of renal recovery after gentamicin exposure is crucial for clinical management.

Purpose of the Study:

• To investigate the metabolic and morphologic effects of gentamicin on rat kidneys.
• To evaluate the recovery process and compare with netilmicin's effects.

Main Methods:

• Rats received gentamicin (100 mg/kg/day) or netilmicin (150 mg/kg/day) for 8-10 days.
• Metabolic balance, urine flow, BUN, plasma creatinine, electrolyte excretion, and proteinuria were monitored.
• Renal morphologic changes were assessed.

Main Results:

• Gentamicin increased urine flow and proteinuria during treatment, with elevated urine flow persisting post-treatment.
• Blood urea nitrogen (BUN) and plasma creatinine normalized 10 days after gentamicin discontinuation.
• Electrolyte excretion remained normal during renal failure development but increased for sodium and potassium during recovery.

Conclusions:

• Gentamicin causes transient renal dysfunction and proteinuria in rats, with significant recovery of kidney function markers within 10 days.
• Netilmicin appears to have a lower nephrotoxic profile compared to gentamicin at the tested doses.