Gentamicin Lock Therapy and Duration-Dependent Catheter-Related Bloodstream Infection Risk in Hemodialysis

Area of Science:

• Nephrology
• Infectious Diseases
• Clinical Pharmacy

Background:

• Antimicrobial lock solutions are recommended for hemodialysis patients when infection rates rise.
• The impact of these solutions on the accumulation of duration-dependent infection risk is not well understood.

Purpose of the Study:

• To compare catheter-related bloodstream infection (CRBSI) rates between gentamicin-heparin and heparin-only lock protocols.
• To investigate the potential of gentamicin-heparin lock to modify the relationship between catheter dwell time and infection risk.

Main Methods:

• A retrospective dual-center cohort study of 266 maintenance hemodialysis patients.
• Comparison of CRBSI incidence density between gentamicin-heparin (n=198) and heparin-only (n=68) groups.
• Analysis of duration-modifying effects using Firth logistic regression and safety evaluation including hearing assessments.

Main Results:

• Gentamicin-heparin lock was associated with a 67% reduction in CRBSI incidence (0.17 vs. 0.52 per 1000 catheter-days).
• While heparin-only lock showed increased CRBSI risk with longer dwell times, gentamicin-heparin lock did not show this duration-dependent risk.
• No significant difference in hearing handicap scores between gentamicin-exposed patients and controls was observed.

Conclusions:

• Gentamicin-heparin lock is effective in reducing CRBSI incidence in hemodialysis patients.
• Preliminary data suggest it may attenuate the duration-dependent accumulation of infection risk.
• Despite high gentamicin resistance in isolates, the lock solution shows clinical utility, warranting further investigation and careful stewardship.