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Urinary myelin figures in gentamicin nephrotoxicity
Abstract:
The nephrotoxicity of gentamicin is associated with formation of myelin figures within the proximal convoluted tubules of experimental animals and man. By electron microscopy, the authors studied urinary sediments of patients who were treated with gentamicin to detect the occurrence of myelin figures. All three patients who had renal impairment and were treated with gentamicin had numerous urinary myelin figures. By contrast, myelin figures were not observed in urinary sediments of four patients who had no renal impairment despite gentamicin therapy, or nine patients who had no renal impairment and did not receive gentamicin therapy. Occasional myelin figures were detected in a urinary sediment of one of eight patients who had renal impairment and no gentamicin therapy. When the urinary sediments of patients who had gentamicin nephrotoxicity were compared with those of patients with Fabry disease, morphologic differences between the myelin figures of the two groups were detected. The study demonstrates the presence of myelin figures in urines of patients with acute renal failure receiving gentamicin, and suggests that the finding of these myelin figures within urine samples may contribute to the diagnosis of gentamicin-induced nephrotoxicity.
Insights
Gentamicin nephrotoxicity is linked to urinary myelin figures. Detecting these figures in urine may aid in diagnosing kidney damage caused by gentamicin treatment.
Area of Science:
- Nephrology
- Toxicology
- Cell Biology
Background:
- Gentamicin nephrotoxicity is a significant clinical concern.
- Myelin figure formation in renal tubules is a known indicator of gentamicin-induced kidney damage in animal models.
- The presence and diagnostic utility of urinary myelin figures in human gentamicin nephrotoxicity remain to be fully elucidated.
Purpose of the Study:
- To investigate the occurrence of urinary myelin figures in patients undergoing gentamicin therapy.
- To determine if urinary myelin figures correlate with gentamicin-induced nephrotoxicity.
- To compare the morphology of urinary myelin figures in gentamicin nephrotoxicity with those in Fabry disease.
Main Methods:
- Electron microscopy was used to examine urinary sediments from multiple patient groups.
- Patients were categorized based on gentamicin treatment and renal function status.
- Urinary sediments were analyzed for the presence and morphology of myelin figures.
Main Results:
- Numerous urinary myelin figures were observed in all three patients with renal impairment receiving gentamicin.
- Myelin figures were absent in patients without renal impairment, regardless of gentamicin therapy.
- Occasional myelin figures were found in one patient with renal impairment but no gentamicin therapy.
- Morphological distinctions were noted between myelin figures associated with gentamicin nephrotoxicity and Fabry disease.
Conclusions:
- The presence of urinary myelin figures is associated with acute renal failure in patients treated with gentamicin.
- Urinary myelin figures may serve as a potential diagnostic biomarker for gentamicin-induced nephrotoxicity.
- Further research can explore the diagnostic value and specificity of urinary myelin figures in kidney disease.