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A randomized trial comparing gentamicin/citrate and heparin locks for central venous catheters in maintenance
John Moran1, Sumi Sun, Ishrag Khababa
1Stanford University School of Medicine, Stanford, CA; Satellite Healthcare Inc, San Jose, CA 94010, USA. john.moran@davita.com
Insights
A gentamicin-based antibiotic lock solution significantly reduced catheter-related bloodstream infections in hemodialysis patients. This intervention proved as effective as heparin in preventing catheter clotting, offering a safer alternative for vascular access management.
Area of Science:
- Nephrology
- Infectious Diseases
- Vascular Access
Background:
- Central venous catheters (CVCs) are crucial for hemodialysis patients lacking alternative vascular access.
- Major CVC complications include catheter-related bloodstream infections (CRBSIs) and catheter lumen clotting.
- Effective management of CVC complications is vital for patient outcomes in maintenance hemodialysis.
Purpose of the Study:
- To evaluate the efficacy of an antibiotic lock solution containing gentamicin in preventing CRBSIs.
- To compare the effectiveness of gentamicin lock solution versus heparin lock solution in preventing catheter clotting.
- To assess the impact of gentamicin lock on CRBSI rates and time to bacteremia in hemodialysis patients.
Main Methods:
- A parallel-group, randomized, multicenter clinical trial involving 303 adult hemodialysis patients with tunneled cuffed CVCs.
- Intervention group received gentamicin (320 μg/mL) in 4% sodium citrate as a catheter lock.
- Control group received standard heparin (1,000 U/mL) catheter lock; both groups received exit site antibiotic ointment.
Main Results:
- The gentamicin lock group showed a significantly lower CRBSI rate (0.28 episodes/1,000 catheter-days) compared to the heparin group (0.91 episodes/1,000 catheter-days; P=0.003).
- Time to the first episode of bacteremia was significantly delayed in the treatment group (P=0.005).
- Rates of thrombolytic agent use for catheter clotting were similar between groups (2.36 vs. 3.42 events/1,000 catheter-days; P=0.2).
Conclusions:
- Routine use of gentamicin (320 μg/mL) in sodium citrate as a catheter lock markedly decreases CRBSI incidence in hemodialysis patients.
- This gentamicin lock solution is as effective as heparin in preventing catheter clotting.
- Study limitations included the inability to fully blind participants due to intervention preparation requirements.
Background:
Central venous catheters (CVCs) are used for vascular access in hemodialysis patients who have no alternative access or are awaiting placement or maturation of a permanent access. The major complications of CVCs are catheter-related bloodstream infection and clotting in the catheter lumen.
Study Design:
Parallel-group, randomized, multicenter clinical trial, with patients blinded to study intervention.
Setting & Participants:
16 free-standing dialysis facilities in Northern California belonging to a single provider. 303 adult maintenance hemodialysis patients who were using a tunneled cuffed CVC for vascular access.
Intervention:
The treatment group received an antibiotic lock containing gentamicin 320 μg/mL in 4% sodium citrate, whereas the control group received the standard catheter lock containing heparin 1,000 U/mL. Both groups received triple-antibiotic ointment on the catheter exit site during dressing changes at each dialysis treatment.
Outcomes:
Catheter-related bloodstream infection and catheter clotting.
Measurements:
Catheter-related bloodstream infection was defined as the occurrence of symptoms consistent with bacteremia together with positive blood culture results in the absence of another obvious source of infection. Catheter clotting was measured as the rate of thrombolytic agent use required to maintain adequate blood flow. A single patient could contribute more than one infection or clotting episode.
Results:
The rate of catheter-related bloodstream infection was 0.91 episodes/1,000 catheter-days in the control group and 0.28 episodes/1,000 catheter-days in the treatment group (P = 0.003). The time to the first episode of bacteremia was significantly delayed (P = 0.005). The rates of tissue plasminogen activator use were similar in the treatment and control groups: 2.36 versus 3.42 events/1,000 catheter-days, respectively (P = 0.2).
Limitations:
The requirement for dialysis facility staff to prepare the treatment intervention prevented a completely blinded study.
Conclusion:
Gentamicin 320 μg/mL in 4% sodium citrate used as a routine catheter lock in CVCs in patients on maintenance hemodialysis therapy markedly decreases the incidence of catheter-related bloodstream infection and is as effective as heparin 1,000 U/mL in preventing catheter clotting.
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