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Original ArticlesDialysis
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Emergence of Gentamicin-Resistant Bacteremia in Hemodialysis Patients Receiving Gentamicin Lock Catheter Prophylaxis

Daniel L. Landry, Gregory L. Braden, Stephen L. Gobeille, Sarah D. Haessler, Chirag K. Vaidya and Stephen J. Sweet
CJASN October 2010, 5 (10) 1799-1804; DOI: https://doi.org/10.2215/CJN.01270210
Daniel L. Landry
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Gregory L. Braden
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Stephen L. Gobeille
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Sarah D. Haessler
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Chirag K. Vaidya
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Stephen J. Sweet
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Abstract

Background and objectives: Antibiotic locks in catheter-dependent chronic hemodialysis patients reduce the rate of catheter-related blood stream infections (CRIs), but there are no data regarding the long-term consequences of this practice.

Design, setting, participants, & measurements: Over a 4-year period, from October 1, 2002, to September 30, 2006, we initiated a gentamicin and heparin lock (GHL) protocol in 1410 chronic hemodialysis patients receiving dialysis through a tunneled catheter in eight outpatient units.

Results: Within the first year of the GHL protocol, our CRI rate decreased from 17 to 0.83 events per 1000 catheter-days. Beginning 6 months after initiation of the GHL protocol, febrile episodes occurred in 13 patients with coagulase-negative Staphylococcus bacteremia resistant to gentamicin. Over the 4 years of GHL use, an additional 10 patients developed 11 episodes of gentamicin-resistant CRI (including 7 with Enterococcus faecalis), in which there were 4 deaths, 2 cases of septic shock requiring intensive care unit admission, and 4 cases of endocarditis. Because of these events, the GHL protocol was discontinued at the end of 2006.

Conclusions: Although the use of GHL effectively lowered the CRI rate in our dialysis population, gentamicin-resistant CRIs emerged within 6 months. Gentamicin-resistant infections are a serious complication of the long-term use of GHLs. Alternative nonantibiotic catheter locks may be preferable to decrease the incidence of CRIs without inducing resistant pathogens.

The use of tunneled central venous catheters (TCCs) for vascular access in chronic hemodialysis patients increased from 18% in 1998 to 27% in 2004 (1). Moreover, the current use of TCC can be as high as 30 to 40% in prevalent patients and 74% in incident patients (2). Although providing life-saving therapy to those awaiting maturation or placement of an arteriovenous (AV) fistula or graft, there is a 2- to 3-fold increased risk of death and a 10- to 20-fold higher risk of bacteremia in patients receiving hemodialysis through a TCC compared with a fistula (2–4).

The incidence of catheter-related blood stream infections (CRIs) in hemodialysis patients ranges from 2.5 to 5.5 cases per 1000 catheter-days. Ten to 20% of CRIs are associated with metastatic complications such as endocarditis, septic arthritis, and epidural abscess, and they cause considerable financial and physical burdens from catheter loss, repeated access procedures, and hospital admissions (3).

Numerous randomized, controlled trials (5–20), as well as meta-analyses of these studies (21–25), have been performed during the past decade to evaluate the benefit of anti-microbial lock solutions in chronic hemodialysis patients with TCCs. These studies have been heterogeneous in nature and used different antibiotics (gentamicin, minocycline, cefazolin, cefotaxime, vancomycin) and nonantibiotic (citrate, taurolidine, EDTA) anti-microbial lock solutions; however, they have all shown a significant decline of 50 to 100% in CRIs compared with standard heparin lock without antibiotics or other sterilizing solutions (3). None of the aforementioned studies have reported anti-microbial resistance or loss of anti-microbial lock solution efficacy, but the longest follow-up period has only been 547 days in one study (13). Therefore, the emergence of bacterial antibiotic resistance from anti-microbial lock solutions and its potential complications remain to be determined.

The main objectives of our study were to assess the long-term consequences of a gentamicin and heparin lock (GHL) protocol in maintenance hemodialysis patients using a TCC and to document the associated emergence of gentamicin-resistant bacteremia in these patients.

Materials and Methods

The institutional review board of Baystate Medical Center and Fresenius Medical Care-North America (Waltham, MA) approved this study. A retrospective chart review using deidentified data was performed in all adults treated with maintenance hemodialysis through a TCC for any time from October 1, 2002 to September 30, 2006 in eight Fresenius Medical Care-owned outpatient dialysis units. The start date of our data collection period coincided with the initiation of the GHL lock protocol in all eight dialysis units. The end study date was chosen as the time when the GHL protocol was discontinued because of the emergence of gentamicin-resistant bacteremias in our patients. A GHL protocol was used in all dialysis patients using a TCC during this period unless there was a known allergy or contraindication to one of the medications.

Hemodialysis Protocol and Catheter Care

Tunneled catheters were primarily either Quinton Permcaths (Kendall, Mansfield, MA) or Tesio catheters (Medcomp, Harleysville, PA), whereas a few patients had the LifeSite (VASCA, Tewksbury, MA). All tunneled catheters were placed by one of four credentialed transplant surgeons under sterile conditions in an operating room setting. Usual TCC care in the outpatient dialysis setting was performed by a protocol described in the Fresenius Medical Care-North America (FMCNA) hemodialysis procedure manual (26–28). Using clean technique with handwashing, nonsterile gloves, masking of both nurse and patient, and a nonsterile towel draped under the catheter, the nursing staff disinfected the connection ports using two gauze sponges soaked with aqueous-based povidine-iodine solution for 5 minutes. The gauze was removed, and the solution was allowed to dry before the catheter was opened. TCCs were not used for any other purpose than for dialysis access. Exit site care was performed during the intradialytic period and consisted of inspection of the catheter exit site, cleansing with povidine-iodine, and placement of a sterile dry gauze dressing. Mupirocin ointment was applied to the TCC exit site before placement of the dry gauze dressing for all patients during each dialysis treatment throughout the study period.

GHL Protocol

A GHL was administered to all outpatient hemodialysis patients using a TCC beginning in October 2002. A standard protocol was implemented where gentamicin and heparin were mixed by a specified dialysis nurse to a final concentration consisting of gentamicin (4 mg/ml) and heparin (5000 units/ml). The choice of final gentamicin dose was based on in vitro evidence indicating that supraphysiologic drug concentrations (100- to 1000-fold higher than therapeutic plasma drug levels) are needed to eradicate biofilm organisms, whereas higher concentrations can be associated with systemic toxicity (5,29). The GHL was administered into the dialysis catheter by syringe at the end of each dialysis session. The total volume administered was equal to that of the tunneled catheter lumens. The GHL was fully aspirated by a nurse or technician at the beginning of the next dialysis treatment.

Definition of CRIs

A CRI was suspected in any dialysis patient with a TCC developing a fever (T > 38°C) or chills. One set of blood cultures was drawn by aseptic technique from the arterial port of the hemodialysis circuit and repeated 20 to 30 minutes later. The decision to initiate empiric antibiotics was at the discretion of the covering nephrologist. When empiric antibiotics were chosen, they would include intravenous vancomycin and either intravenous levofloxacin or gentamicin. Peripheral blood cultures were generally not drawn in our population because of difficulty with peripheral vein access and/or desire to preserve potential vascular access sites. Blood cultures were analyzed at an outside laboratory (Spectra Laboratories, Rockleigh, NJ) or at Baystate Medical Center if the patient developed signs or symptoms of infection requiring emergency department or inpatient evaluation. A CRI was defined as at least one positive blood culture in a patient with a TCC, clinical signs of infection, and compelling evidence of the catheter as the only source. This outpatient definition of CRI has been recommended by Allon (30) and has been used in numerous anti-microbial lock solution trials.

If a febrile patient started on empiric antibiotics was found to have positive blood cultures, antibiotics were adjusted based on the culture sensitivities and continued for a total of 14 days (unless systemic complications developed, wherein intravenous antibiotics were administered for 6 weeks). The GHL was continued throughout this time period. The decision to remove a TCC was not standardized by a set protocol but was based on the discretion of the treating nephrologist. In general, a TCC was removed if a patient remained febrile after 48 hours of empiric antibiotics, had evidence of clinical deterioration while on antibiotics, had evidence of a tunnel infection, or had a relapse of an infection with the same micro-organism.

Clearance of CRI was defined by two sets of negative blood cultures in an afebrile patient without signs or symptoms of active infection. Blood cultures were routinely drawn at the completion of systemic antibiotics.

Statistical Analyses

Mean and percentage values were used to summarize baseline characteristics and outcome data. χ2 tests were used to compare proportions. P < 0.05 was considered significant.

Results

The total number of maintenance hemodialysis patients in our eight outpatient units during the study period (October 1, 2002 to September 30, 2006) was 1863 patients. Of this group, 1410 patients received dialysis through a TCC with associated GHL for at least 1 day during the study period, for a total of 142,365 catheter-days.

CRI Incidence

GHL lowered the total rate of CRI during the study period by 95% from an initial very high level of 17 CRI per 1000 catheter-days to 0.83 CRI per 1000 catheter-days at the end of year 1 and 1.2 CRI per 1000 catheter-days during the fourth year of the study.

Outpatient Unit Bacteremia Data

For all patients receiving hemodialysis during the 4-year study period (TCC and AV access), there were 131 episodes of bacteremia in 113 patients (63 men and 50 women). Eighty of the 131 bacteremias developed in patients with active TCCs, as summarized in Figure 1.

Figure 1.
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Figure 1.

Total bacteremias from October 2002 to September 2006. *Patients exposed to TCCs and GHL within the preceding 6 months.

A total of 121 Gram-positive bacteria (including 48 Staphylococcus aureus, 37 coagulase-negative Staphylococcus, and 17 Enterococcus faecalis) and 17 Gram-negative organisms were identified by blood culture and are listed in Table 1. Seven patients had polymicrobial bacteremias during the study period (none of which occurred in TCC patients).

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Table 1.

Microbiological data of all dialysis bacteremias: 2002–2006

Gentamicin-Resistant Bacteremias

The emergence of gentamicin-resistant CRI was first noted in March 2003, 6 months after the initiation of the GHL protocol. A total of 23 patients ultimately developed 24 gentamicin-resistant CRIs. The total number of gentamicin-resistant infections per year compared with the overall decline in CRI rate is shown in Figure 2. Gentamicin resistance was observed in 26% (21 episodes) of the 80 catheter-associated bacteremias and in 6.5% (3 episodes) of the 46 AV access patients that had been exposed to a TCC and GHL (Figure 1) in the preceding 12 months (P = 0.021). Five catheter-naïve patients developed bacteremias during the study period, but none were gentamicin resistant. The demographics of the 23 patients with gentamicin-resistant bacteremia are listed in Table 2.

Figure 2.
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Figure 2.

CRI rates and cases of gentamicin resistance.

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Table 2.

Demographics of patients with gentamicin-resistant bacteremias

Coagulase-negative Staphylococcus was the most common cause of gentamicin-resistant CRIs (13 patients) in patients with or without a TCC during the 4-year study period (Table 3). Of these, 12 patients had a TCC and only one had an AV access. This latter individual had been exposed to a TCC and GHL within the preceding 12 months.

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Table 3.

2003–2006 Coagulase-Negative Staphylococcus Bacteremias (37)

Characteristics of and complications of gentamicin-resistant CRIs are shown in Table 4. Gentamicin-resistant Enterococcus bacteremia was first noted 18 months after initiation of our GHL protocol and was eventually diagnosed in seven patients. Six of the seven patients required hospitalization with two cases of sepsis, three cases of endovascular vegetation (two cases of subacute bacteria endocarditis and one case of vegetation noted on an ulcerated plaque of the aortic arch), and two deaths.

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Table 4.

Characteristics of gentamicin-resistant bacteremias

Gentamicin-resistant bacteremias resulted in the removal of 12 TCCs. Ten of our patients required hospitalization for a mean of 9.7 days, with two patients requiring intensive care unit admission for septic shock. Ultimately, five patients developed either subacute bacterial endocarditis or endovascular infection involving the aortic arch, and four patients died within 60 days of documented gentamicin-resistant bacteremias (three from sepsis and one from myocardial infarction). Gentamicin-resistant bacterial isolates and the outcome results of these 25 patients are summarized in Table 4.

Discussion

During the 4-year period that we used a GHL, we noted a significant 95% decrease in the rate of catheter-related bloodstream infections in our chronic hemodialysis patients, which supports earlier studies of the anti-bacterial efficacy of GHL solutions (5,6,11,12,14–17). Moreover, the 4-year duration of our GHL treatment is the longest yet reported and shows that a decrease in CRIs with GHL solution can be sustained for years.

The most troubling finding from our study was the emergence of gentamicin-resistant gram-positive infections during the period of GHL exposure. Thirteen of our patients developed bacteremia with gentamicin-resistant coagulase-negative Staphylococcus. We did not find gentamicin-resistant coagulase-negative Staphylococcus bacteremia in our dialysis patients without TCCs (except for one patient with an arteriovenous graft that had been exposed to GHL within the last 12 months who developed gentamicin-resistant coagulase-negative Staphylococcus). The first report of antibiotic resistant coagulase-negative Staphylococcus in dialysis patients was described in a French dialysis study in 2004, but the study was only published as an abstract, and it had a much shorter duration of GHL use than our study (31). In this study, 100% of surveillance cultures positive for Staphylococcus epidermidis were resistant to gentamicin, methicillin, and quinolones after 2 years of GHL exposure, but there were no reports of clinical bacteremias. Resistance levels dropped dramatically 18 months after discontinuation of the GHL protocol.

A single-center observational study from New Zealand found a trend toward increasing gentamicin resistance among coagulase-negative Staphylococci isolated from hemodialysis patients with a TCC receiving a GHL (20). However, a similar pattern of gentamicin-resistant coagulase-negative Staphylococcus bacteremia was simultaneously found in their general hemodialysis population without TCC-associated infection. In addition, the gentamicin concentration used in their lock solution (1 mg/dl) was lower than doses previously deemed to be effective in preventing CRI and may have actually induced antibiotic resistance while not resulting in a significant decrease in the prevalent CRI rate (20).

We first noted coagulase-negative Staphylococcus and Streptococcus veridans resistant to gentamicin 6 months into the GHL protocol. Resistant Enterococcus infections began 18 months after our GHL protocol was initiated and increased from two cases in 2004 to four cases in 2006. The lengthy duration of antibiotic lock exposure (average of 297.5 days) and the 4-year follow-up in our study has allowed us to observe these novel findings.

Gentamicin-resistant bacteremia was associated with significant morbidity in our patients, particularly in the seven patients with Enterococcus faecalis CRIs. Overall, 24 episodes of gentamicin-resistant bacteremia led to 10 inpatient admissions, loss of TCCs in 12 patients, subacute bacterial endocarditis and/or sepsis in 7 patients, and 4 deaths (3 from sepsis and 1 from myocardial infarction).

Our study has weaknesses associated with any uncontrolled, retrospective study. Although our data showed evidence for the development of gentamicin resistance from the use of GHL, it is difficult to establish causality. The CRI rate at the onset of our study was also very high compared with reported rates in the literature. This raises the question of whether similar rates of antibiotic resistance would be found in units with lower baseline CRI rates. We did not collect data regarding catheter vintage or specifically provide catheter management (e.g., catheter removal in CRI) by a set protocol during the study period. Another limitation was our inability to obtain baseline gentamicin resistance data in our dialysis population because gentamicin sensitivities were not routinely tested by our outpatient laboratory until October 2002. Some strengths of our study are that it was multicentered, included more patients and catheter days than most of the meta-analyses, and provided observation of the GHL process over a longer period (4 year) than previously reported (20–24).

The use of an alternative, nonantibiotic, catheter lock is a possible solution to prevent CRI in chronic hemodialysis patients with a TCC. Unfortunately, currently available alternative locks all have ongoing questions and concerns beyond their rather limited study data. Taurolidine with 4% sodium citrate has been shown to be effective in several studies but may be associated with an increase in catheter thrombosis and is not currently available in the United States (7,32,33). High-dose citrate (30 to 47%) has been well studied but is complicated by the rare but fatal risk of hypocalcemia that led to the FDA's recall of 47% citrate in 2000 (3,9). Weijmer et al. (9) have shown a reduction in CRI and CRI-related mortality using 30% trisodium citrate; however, recent studies by Power et al. (34) and Venditto et al. (35) did not show a benefit in lowering the catheter-related bacteremia rate when using 47% sodium citrate compared with 5% heparin. Ethanol locks (with or without sodium citrate) seem to show benefit in the prevention of infection in certain types of central catheters, but their long-term compatibility with polyurethane-based catheters is still in question (36,37). Low-dose citrate with methylene blue and parabens (Zuragen; Ash Access Technology) has also been studied in the laboratory and in a clinical trial (Assessing Zuragen Efficacy and Safety in the Prevention and Treatment of Infections in Catheters trial) with promising results (38,39).

Conclusions

Our study suggests that the long-term use of a GHL protocol decreases the rate of CRIs in hemodialysis patients with a TCC but is also associated with the undesirable consequences of the emergence of gentamicin-resistant gram-positive bacteremias that developed as early as 6 months after GHL use. The need to safely reduce the incidence of CRIs without inducing the emergence of resistant bacteria must await further studies of alternative nonantibiotic catheter lock solutions. In the interim, the crucial issue is whether the benefit of a significant decrease in the incidence of catheter-associated bacteremias with gentamicin lock in hemodialysis patients outweighs the risk of the emergence of antibiotic resistant bacteremia in these patients.

Disclosures

None.

Acknowledgments

This study was presented in part at both the National Kidney Foundation Spring clinical meeting (March 25–29, 2009; Nashville, TN) and the American Society of Nephrology Fall clinical meeting (October 29-September 1, 2009; San Diego, CA). We thank Jean Dowd, RN, and Tamara Bissaillon, RN, for invaluable research support.

Footnotes

  • Published online ahead of print. Publication date available at www.cjasn.org.

  • Received February 9, 2010.
  • Accepted May 23, 2010.
  • Copyright © 2010 by the American Society of Nephrology

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Clinical Journal of the American Society of Nephrology
Vol. 5, Issue 10
1 Oct 2010
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Emergence of Gentamicin-Resistant Bacteremia in Hemodialysis Patients Receiving Gentamicin Lock Catheter Prophylaxis
Daniel L. Landry, Gregory L. Braden, Stephen L. Gobeille, Sarah D. Haessler, Chirag K. Vaidya, Stephen J. Sweet
CJASN Oct 2010, 5 (10) 1799-1804; DOI: 10.2215/CJN.01270210

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Emergence of Gentamicin-Resistant Bacteremia in Hemodialysis Patients Receiving Gentamicin Lock Catheter Prophylaxis
Daniel L. Landry, Gregory L. Braden, Stephen L. Gobeille, Sarah D. Haessler, Chirag K. Vaidya, Stephen J. Sweet
CJASN Oct 2010, 5 (10) 1799-1804; DOI: 10.2215/CJN.01270210
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More in this TOC Section

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  • Associations between Deprivation, Geographic Location, and Access to Pediatric Kidney Care in the United Kingdom
  • Variability in Culture-Negative Peritonitis Rates in Pediatric Peritoneal Dialysis Programs in the United States
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Dialysis

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Cited By...

  • REDUcing the burden of dialysis Catheter ComplicaTIOns: a National approach (REDUCCTION) - design and baseline results
  • Prevention of Bloodstream Infections in Patients Undergoing Hemodialysis
  • Management of a Patient with Catheter-Related Bloodstream Infection
  • A Novel Nonantibiotic Nitroglycerin-Based Catheter Lock Solution for Prevention of Intraluminal Central Venous Catheter Infections in Cancer Patients
  • Controversy About Dialysis for an Adolescent
  • Comparison of Topical Chlorhexidine and Mupirocin for the Prevention of Exit-Site Infection in Incident Peritoneal Dialysis Patients
  • In Vitro Assessment of the Antimicrobial Efficacy of Optimized Nitroglycerin-Citrate-Ethanol as a Nonantibiotic, Antimicrobial Catheter Lock Solution for Prevention of Central Line-Associated Bloodstream Infections
  • Systematic Review and Meta-Analysis on Management of Hemodialysis Catheter-Related Bacteremia
  • Quasi-Experimental Study of Sodium Citrate Locks and the Risk of Acute Hemodialysis Catheter Infection among Critically Ill Patients
  • Biofilm-Related Infections: Bridging the Gap between Clinical Management and Fundamental Aspects of Recalcitrance toward Antibiotics
  • Comparative Effectiveness of Two Catheter Locking Solutions to Reduce Catheter-Related Bloodstream Infection in Hemodialysis Patients
  • Reducing Catheter-Related Infections in Hemodialysis Patients
  • Stability and compatibility of antimicrobial lock solutions
  • The Effect on Peritoneal Dialysis Pathogens of Changing Topical Antibiotic Prophylaxis
  • Gentamicin-Resistant Infections in Peritoneal Dialysis Patients Using Topical Gentamicin Exit-Site Prophylaxis: A Report of Two Cases
  • Minocycline-EDTA Lock Solution Prevents Catheter-Related Bacteremia in Hemodialysis
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