Woundviewer.med-surv.de. Published on March 23, 2005 as doi: 10.1681/ASN.2004110997
Randomized, Controlled Trial of Topical Exit-Site
Application of Honey (Medihoney) versus Mupirocin for the
Prevention of Catheter-Associated Infections in Hemodialysis
David Wayne Johnson, Carolyn van Eps, David William Mudge, Kathryn Joan Wiggins,Kirsty Armstrong, Carmel Mary Hawley, Scott Bryan Campbell, Nicole Maree Isbel,Graeme Robert Nimmo, and Harry GibbsDepartment of Renal Medicine, University of Queensland at Princess Alexandra Hospital, Brisbane, Australia The clinical usefulness of hemodialysis catheters is limited by increased infectious morbidity and mortality. Topical antiseptic
agents, such as mupirocin, are effective at reducing this risk but have been reported to select for antibiotic-resistant strains.
The aim of the present study was to determine the efficacy and the safety of exit-site application of a standardized antibacterial
honey versus mupirocin in preventing catheter-associated infections. A randomized, controlled trial was performed comparing
the effect of thrice-weekly exit-site application of Medihoney versus mupirocin on infection rates in patients who were
receiving hemodialysis via tunneled, cuffed central venous catheters. A total of 101 patients were enrolled. The incidences of
catheter-associated bacteremias in honey-treated (n ⴝ 51) and mupirocin-treated (n ⴝ 50) patients were comparable (0.97 versus
0.85 episodes per 1000 catheter-days, respectively; NS). On Cox proportional hazards model analysis, the use of honey was not
significantly associated with bacteremia-free survival (unadjusted hazard ratio, 0.94; 95% confidence interval, 0.27 to 3.24; P ⴝ
0.92). No exit-site infections occurred. During the study period, 2% of staphylococcal isolates within the hospital were
mupirocin resistant. Thrice-weekly application of standardized antibacterial honey to hemodialysis catheter exit sites was
safe, cheap, and effective and resulted in a comparable rate of catheter-associated infection to that obtained with mupirocin
(although the study was not adequately powered to assess therapeutic equivalence). The effectiveness of honey against
antibiotic-resistant microorganisms and its low likelihood of selecting for further resistant strains suggest that this agent may
represent a satisfactory alternative means of chemoprophylaxis in patients with central venous catheters.
J Am Soc Nephrol 16: ???–???, 2005. doi: 10.1681/ASN.2004110997 providing rapid, temporary access for the provision of noncuffed devices (9–14). Recently, our group demonstrated that hemodialysis to patients with serious acute or chronic the topical application of 2% mupirocin ointment to the exit sites renal failure. Unfortunately, the clinical usefulness of this method of hemodialysis patients with tunneled, cuffed catheters engen- is severely limited by the frequent occurrence of bloodstream dered a further reduction in the rates of catheter-associated staph- infections in up to 40% of cases (1–3). A number of registry (4,5) ylococcal exit-site infection and bacteremia (3). Median infection- and observational cohort studies (6) have indicated that there has free survival time was increased from 55 to 108 d, such that one been an increasing reliance on hemodialysis catheters in incident episode of bacteremia was prevented for every 3.7 patients hemodialysis patients ranging from 30% of patients in Europe and treated. Unfortunately, a potentially significant disadvantage of Australia to 60% in the United States. Recent studies have sug- mupirocin chemoprophylaxis is the appearance of resistant staph- gested further that the use of hemodialysis catheters is associated ylococcal strains, which have been reported in a number of units with a 1.5- to 3-fold increase in both all-cause and infectious in other hospitals (15). It would clearly be ideal to develop an mortality (4,7,8). A number of randomized, controlled trials have alternative, safer strategy to mupirocin for preventing catheter- demonstrated convincingly that tunneled, cuffed catheters are associated infections without selecting further resistant strains.
associated with a much lower risk for bacterial colonization, exit- A promising agent in this regard is honey. Honey has been used from ancient times as a method of accelerating woundhealing (16) and is mentioned for healing purposes in the Bible, Received November 24, 2004. Accepted February 11, 2005. the Koran, and the Torah (17). Anecdotally, honey has been Published online ahead of print. Publication date available at www.jasn.org. claimed to reduce inflammation; debride necrotic tissue; reduce Address correspondence to: Prof. David Johnson, Department of Renal Medicine,
edema; and promote angiogenesis, granulation, and epithelial- Level 2, Ambulatory Renal and Transplant Services Building, Princess Alexandra ization (18). More recently, there have been a number of reports Hospital, Ipswich Road, Woolloongabba, Brisbane, Queensland 4102, Australia.
of honey being used successfully as a dressing for wounds, Phone: ⫹61-7-3240-5080; Fax: ⫹61-7-3240-5480; E-mail: [email protected]
qld.gov.au including burns, ulcers, infected surgical wounds, necrotizing Copyright 2005 by the American Society of Nephrology Journal of the American Society of Nephrology J Am Soc Nephrol 16: ???–???, 2005 soft tissue infections, meningococcal wounds, and abdominal Central venous catheters were dedicated to hemodialysis use and were wound dehiscence (17,19 –21). A meta-analysis of seven ran- not accessed for other purposes. Subsequent catheter-site care was domized, controlled trials involving the use of honey as a performed by trained hemodialysis registered nurses using a rigorous wound dressing showed it to be superior to antiseptics and/or aseptic technique. Primapore dressings were changed thrice weekly ateach hemodialysis treatment, and the sites were recleansed with 10% systemic antibiotics for wound healing, maintenance of steril- povidone iodine solution, in accordance with the Kidney Disease Out- ity, and eradication of infection (22).
comes Quality Initiative guidelines (27). Patients who were allocated to In laboratory studies, some honeys have been shown to exert the honey group additionally received approximately 3 ml of Medi- an antimicrobial action against a broad spectrum of fungi and honey applied to their exit sites with each dressing change. Patients bacteria, including antibiotic-resistant bacteria such as methi- who were allocated to the mupirocin group had mupirocin ointment cillin-resistant Staphylococcus aureus, multidrug-resistant gram applied to their exit sites with each dressing change according to negative organisms, and vancomycin-resistant enterococci standard unit protocols (approximately 10 mm of ointment was (23,24). The reasons for this antibacterial activity include a squeezed directly on to their exit sites from a 15-g tube with an outlet relatively low water activity (0.56 to 0.59), low pH (3.2 to 4.5), diameter of 5 mm with each dressing change). Patients were treated the production of hydrogen peroxide on dilution (as a result of with topical honey or mupirocin for the entire period that their catheter the presence of the enzyme glucose oxidase), and phytochem- remained in situ. At the completion of each hemodialysis treatment,sodium heparin (1000 U/ml) was injected into each lumen in a volume ical components (including flavonoids and phenolic acids) (24).
equivalent to the priming volume of the catheter.
Despite a considerable accumulated experience of honey use in At the time of inclusion in the study, demographic and clinical data wound infections, antimicrobial resistance has not yet been were recorded. Patients had their anterior nares cultured for S. aureus, reported, thereby making it very attractive as a potential means but identified nasal carriers were not treated. Patients were followed up of antimicrobial prophylaxis (25). The aim of the present study until the catheter was removed. The primary outcome measure was was to determine the efficacy and the safety of topical exit-site catheter-related bacteremia. Secondary outcome measures included application of standardized antibacterial honey (Medihoney) catheter exit-site infection and adverse reactions (including mupirocin versus mupirocin in preventing infection secondary to tunneled, resistance among staphylococcal isolates). Data were censored at the cuffed hemodialysis catheters.
time of catheter removal (when unrelated to catheter-associated infec-tion), death (when unrelated to catheter-associated infection), or theend of the study on October 4, 2004.
Materials and Methods
All adult patients who had acute or chronic renal failure and re- Catheter-related infections were defined according to standard quired hemodialysis via a newly inserted tunneled, cuffed central guidelines (9,28,29). Catheter-associated bacteremia was defined as ei- venous catheter at the Princess Alexandra Hospital between February ther (1) a single positive blood culture together with a positive culture 1, 2002, and July 28, 2004, were invited to participate in the study.
of the catheter tip or exit site with an identical organism or (2) two or Informed consent was obtained from all patients before their inclusion more positive blood cultures (or a single positive blood culture for S. in the trial, and the study protocol was reviewed and approved by the aureus) with no evidence of infection source other than the device.
Princess Alexandra Hospital Research Ethics Committee.
Exit-site infection was defined as purulent exit-site discharge or two ofthree of the following: Exit-site erythema, tenderness, and induration Study Design with a positive culture.
The study was a prospective, open-label, randomized, controlled trial. Patients who were enrolled in the study were randomly as- signed to receive either topical ␥-irradiated, commercially available, Exit-site swabs were obtained using sterile, premoistened calcium pooled antibacterial honeys including Leptospermum sp honey (Medi- alginate swabs in all suspected cases of catheter-associated infection.
honey; Medihoney Pty Ltd, Brisbane, Australia) or standard 2% The swabs were streaked onto plates that contained blood agar, colis- calcium mupirocin ointment (Bactroban; SmithKline Beecham Phar- tin-nalidixic acid agar, McConkey's media, and mannitol-salt agar. All maceuticals, Sydney, Australia; mupirocin group) in addition to cultures were incubated at 35°C for 48 h and examined daily for standard exit-site care and 10% povidone iodine disinfection. The growth. Patients with suspected bacteremia (fever ⬎38°C, rigors, leu- randomization was performed using sequentially numbered, kocytosis, or clinically unwell) were investigated with exit-site swabs opaque, sealed envelopes before catheter insertion. The sequence of and at least two sets of blood cultures (20 ml). Staphylococcal isolates interventions was obtained from a computer-generated random- were screened routinely for mupirocin resistance by the disk suscepti- number list with randomization blocks of 10.
bility method (30). The laboratory was blinded to the patient's alloca- All patients underwent ultrasound-guided placement of a subcuta- neously tunneled, internal jugular venous hemodialysis catheter (Perm- In cases of suspected catheter-associated bacteremia, the catheter was Cath; Quinton Instrument Company, Seattle, WA) by dedicated vascu- removed and the tip was sent for microbiologic culture. Approximately lar access surgeons according to the method described by Schwab et al. 50 mm of catheter tip was rolled across chocolate agar plates and (26). A prophylactic preoperative antibiotic (cephazolin 1 g intrave- processed according to the semiquantitative method of Maki et al. (29).
nously) was prescribed in all cases. All catheters received 10% povi- Catheter colonization was defined as the recovery of ⬎15 colony- done iodine disinfection at the site of insertion (contact time 3 to 5 min forming units.
followed by complete drying) and were covered by an opaque, air-permeable, nonwoven fabric dressing (Primapore, Smith & Nephew, Sydney, Australia). Chest radiographs were obtained after insertion to Normality of data was evaluated by the Kolmogorov-Smirnov test confirm the position of the catheter tip in the superior vena cava.
with Lilliefor's correction. Results are expressed as mean ⫾ SEM for J Am Soc Nephrol 16: ???–???, 2005 Medihoney versus Mupirocin for Dialysis Catheters continuous parametric data, median (interquartile range) for continu- ysis, the type of prophylaxis administered (honey or mupiro- ous nonparametric data, and frequencies and percentages for categor- cin) was not significantly associated with bacteremia-free sur- ical data. Comparisons between the honey and mupirocin groups were vival (unadjusted hazard ratio for honey, 0.94; 95% confidence performed using t test or the Mann-Whitney U test, depending on data interval, 0.27 to 3.24; P ⫽ 0.92). Multivariate analysis did not distribution. Differences in proportions were evaluated by 2 or Fisher alter this finding (data not shown). No exit-site infections were exact test. Infection-free survival curves, survival probabilities, and observed in any patients during the period of the study.
estimated mean survival times were generated according to theKaplan-Meier method. Differences in the survival curves between thetwo groups were evaluated using the log rank test. A multivariate Adverse Reactions and Cost Cox's proportional hazards model was also applied, which included Medihoney and mupirocin both were well tolerated. Tran- allocated group, age, gender, race, body mass index, diabetic status, sient, mild local skin discomfort was observed in one patient ischemic heart disease, presence of infection at the time of randomiza- who was treated with honey. This resolved within a few days tion, nasal staphylococcal colonization, and serum albumin as covari- despite continued administration of the agent. A similar tran- ates. The proportional hazards assumption was checked both graphi- sient local skin reaction associated with erythema was observed cally and by hypothesis testing. Graphical examination was done using in one patient who received topical mupirocin ointment. No a log-cumulative hazard plot. The hypothesis test was carried out after systemic adverse reactions to either honey or mupirocin oint- generating Schoenfield and scaled Schoenfield residuals. All data were ment were noted during the study period.
analyzed on an intention-to-treat basis using the statistical software Mupirocin-resistant strains were not detected in any staphy- package SPSS release version 10.0.5 (SPSS Inc., Chicago, IL). P ⬍ 0.05 lococcal isolates from study patients with catheter-associated was considered significant.
Prospective power calculations for the infection-free survival analy- bacteremias. During the period of the trial, the proportion of ses were performed using the software package PS version 1.0.17 staphylococcal isolates from all microbiologic specimens within (Vanderbilt University Medical Center, Nashville, TN). It was esti- the hospital that were mupirocin resistant was 2.0% (26 of 1328 mated prospectively that the study had adequate statistical power (80% staphylococcal isolates). Approximately 70% of these mupiro- probability) to detect at least a doubling in mean catheter-associated cin-resistant isolates were identified in patients from the Renal infection-free survival from a control (mupirocin) level of 320 d if 96 Unit, but none of these individuals was involved in the present patients were recruited in the study (48 in each group), assuming an ␣ level of 0.05, accrual time of 730 d, and additional follow-up time after The median cost of exit-site application for the average life of the end of recruitment of 90 d.
a catheter was $13.00 AUD per patient in the honey group and$11.10 AUD per patient in the mupirocin group.
A total of 101 patients required insertion of tunneled, cuffed The present study demonstrated that regular, thrice-weekly, central venous catheters for the provision of hemodialysis at topical exit-site application of standardized antibacterial honey the Princess Alexandra Hospital between June 1, 2002, and July was safe and cost-effective and resulted in a comparable rate of 31, 2004. All agreed to participate in the study, and none was catheter-associated infection to that obtained with topical lost to follow-up. No patients were excluded from the study.
mupirocin exit-site application in patients with tunneled, Fifty-one patients were randomly allocated to the honey group, cuffed hemodialysis catheters. To our knowledge, this is the and 50 patients received mupirocin. There were no significant first randomized, controlled trial to have examined the poten- differences between the two groups with respect to their base- tial utility of honey as an antimicrobial prophylactic agent.
line characteristics, except for a higher mean age and a trend Moreover, the results of this study are potentially generalizable toward a greater frequency of ischemic heart disease in the to the prevention of infections associated with a number of mupirocin group (Table 1). Median (interquartile range) fol- prosthetic devices (e.g., central venous catheters, Hickman cath- low-up was 95 (55 to 157) days.
eters, Tenckhoff catheters, T-tubes, nephrostomy tubes).
Previous randomized, controlled trials have shown convinc- ingly that, compared with placebo or no treatment, topical Catheter-associated bacteremias occurred with similar fre- mupirocin application was associated with a seven- to 13-fold quencies in honey-treated (n ⫽ 6, 12%) and mupirocin-treated reduction in catheter-associated bacteremias in patients with patients (n ⫽ 5, 10%; P ⫽ 0.78). The causes of bacteremia in the either noncuffed, nontunneled (2) or tunneled, cuffed hemodi- honey and mupirocin groups were S. aureus (1 or 17% versus 1 alysis catheters (3). Moreover, the observed rates of catheter- or 20%), coagulase-negative staphylococci (2 or 33% versus 1 or associated bacteremia in mupirocin-treated patients in those 20%), micrococcus (1 or 17% versus 0 or 0%), Serratia marcescens studies (0.7 and 1.6 episodes per 1000 catheter days, respec- (2 or 33% versus 0 or 0%), Klebsiella pneumoniae (0 or 0% versus tively) were similar to those observed in the present investiga- 1 or 20%), and Stenotrophomonas maltophilia (0 or 0% versus 2 or tion (0.85 episodes per 1000 catheter-days). However, since the 40%). The incidences of bacteremia in the two groups were 0.97 publication of these earlier investigations, there has been in- and 0.85 episodes per 1000 catheter-days, respectively (NS).
creasing concern regarding the emergence of mupirocin-resis- Mean ⫾ SE actuarial bacteremia-free survival periods were tant staphylococci (31) and the potential for therapeutic failure 367 ⫾ 42 and 334 ⫾ 17 d, respectively (log rank 0.01, P ⫽ 0.92; (15). After introducing mupirocin chemoprophylaxis in our Figure 1). On univariate Cox proportional hazards model anal- own unit for the prevention of peritoneal dialysis and hemodi- Journal of the American Society of Nephrology J Am Soc Nephrol 16: ???–???, 2005 Table 1. Baseline patient characteristics (n ⫽ 51) (n ⫽ 50) Body mass index (kg/m2) Serum albumin (g/L) Serum ferritin (g/L) Ischaemic heart disease Cerebrovascular disease Peripheral vascular disease Nasal staphylococcal carriage Renal failure cause acute-on-chronic renal failure polycystic kidney disease chronic tubulointerstitial nephritis Catheter indication acute temporary dialysis commencing chronic dialysis clotted vascular access failed peritoneal dialysis Infection at time of catheter insertion peritoneal dialysis peritonitis upper respiratory tract infection alysis catheter infections, high-level mupirocin resistance has Continued use of topical antimicrobial agents has provided emerged, ranging between 2 and 6% of all staphylococcal iso- the selective pressure that has led to the emergence of antibi- lates. None of the isolates from patients in the present study otic-resistant strains, which, in turn, has driven the continued displayed mupirocin resistance, although this may have been search for alternative, safer topical antiseptic agents with due to the relatively small patient numbers and short duration broad-spectrum antimicrobial activities. In this regard, stan- of follow-up. Another group (32) has not observed an increase dardized antibacterial honey seems to be a very promising in high-level resistance after topical mupirocin administration, candidate. Although mupirocin has been shown to be effective but this finding is contradicted by several reports of disturbing primarily against Gram-positive organisms, selected honeys increases in resistance (to between 12.4 and 66% of staphylo- have been found to be highly effective against fungi (including coccal isolates) (31,33–35), particularly with widespread and Aspergillus fumigatus, Aspergillus flavus, Penicillium citrinum, prolonged mupirocin use (31). Furthermore, Perez-Fontan et al. Trichophyton rubrum, Trichophyton tonsurans, and Candida albi- (34) observed a greater incidence of exit-site infections in pa- cans), Gram-negative bacteria (including Escherichia coli, Kleb- tients who were colonized with mupirocin-resistant S. aureus siella pneumoniae, Pseudomonas spp., Proteus mirabilus, Haemophi- compared with those who were colonized with sensitive organ- lus influenzae, Enterobacter cloacae, and Shigella dysenteriae), and isms, suggesting that the development of mupirocin resistance Gram-positive organisms (including streptococci, staphylo- can have adverse clinical consequences.
cocci, enterococci, and clostridia) (18,22). The minimum inhib-
J Am Soc Nephrol 16: ???–???, 2005 Medihoney versus Mupirocin for Dialysis Catheters occasionally been reported to contain viable spores of Clostrid-ium botulinum (41).
The potential weaknesses of this trial were its open-label design, the possibility of type 2 statistical error, and the lack ofstatistical power to confirm therapeutic equivalence of honeyand mupirocin. The absence of blinding could have potentiallyintroduced co-intervention and observer biases. For example,Wagman et al. (42) showed an eightfold higher rate of infectionsassociated with tunneled, cuffed catheters that were managedoutside study protocol compared with those that were man-aged using the technique required by the study. Such protocoldeviations were strictly avoided in the present study by ensur-ing that nursing staff adhered to a standardized exit-site careprotocol and carefully documented their actions at each dress-ing change. Moreover, observer bias was minimized by the useof clearly defined, objective outcome measures and by blindingto the patient's study group assignment the microbiology lab-oratory staff who processed culture samples. As stated in theMaterials and Methods section, the study was adequately pow-ered to have detected a halving (or doubling) of risk in thehoney arm compared with the mupirocin arm. A smaller sig-nificant difference between the two groups could not be ex- Figure 1. Catheter-associated bacteremia-free survival in honey- cluded because of the possibility of a type 2 statistical error. In and mupirocin-treated patients. The difference between the particular, it is important to emphasize that the study lacked groups was not statistically significant (log rank score 0.33, P ⫽ statistical power to have determined confidently that honey 0.87). The number of patients at risk within each group is and mupirocin were therapeutically equivalent. Although the indicated beneath the corresponding time periods on the x axis.
limits for establishing equivalence are arbitrary, to have had an80% probability of determining that the differences betweenhoney and mupirocin were no greater than 10% using the as- itory concentrations of honey for all of these species were sumptions of the original power calculations, a minimum of 4688 generally well below 10% vol/vol (18,22,24,36) and did not patients in total would have been required. The results of the seem to be appreciably different in antibiotic-resistant strains, present trial therefore should be considered preliminary, such that such as methicillin-resistant S. aureus, multidrug-resistant much larger studies will be needed to confirm that honey offers Gram-negative organisms, and vancomycin-resistant entero- prophylactic efficacy that is equivalent to mupirocin.
cocci (18,24). The lack of significant variance in the sensitivity to In conclusion, the present investigation demonstrated that some honeys of a large number of isolates collected from a wide the application of honey (Medihoney) to the exit sites of tun- range of clinical settings contrasts markedly with the variations neled, cuffed hemodialysis catheters was safe and effective seen in antimicrobial sensitivities to antibiotics and strongly compared with topical 2% calcium mupirocin, although our suggests that there is no mechanism of resistance to the anti- investigation did not have sufficient statistical power to con- bacterial activity of honey (37). Indeed, despite a considerable firm therapeutic equivalence. This study has potentially impor- accumulated experience of honey use in wound infections, tant implications for the treatment of hemodialysis patients antimicrobial resistance has not yet been reported.
with temporary hemodialysis catheters and possibly for the The mechanisms of action of honey have not been fully treatment of patients with other types of catheters and pros- elucidated, but hyperosmolality, acidity, hydrogen peroxide thetic devices, who are at greatly increased risk for morbidity generation, and phytochemical components (including fla- and mortality from catheter-related sepsis. The finding that vonoids and phenolic acids) have been considered to be impor- honey administration to such patients is safe, inexpensive, un- tant (17,36). The floral source of the honey also seems to be likely to select for further antibiotic-resistant strains, and asso- crucial, because some honeys (e.g., manuka honey from New ciated with acceptably low catheter-related bacteremia rates Zealand and a related Leptospermum honey from Australia) can suggests that this agent may represent a satisfactory, alternative be up to 100 times more active against microorganisms than means of preventing hemodialysis catheter infections. Future others (36). Honey has also been demonstrated to possess a much larger trials are recommended to confirm the equivalence number of additional advantages over conventional topical of honey and mupirocin chemoprophylaxis.
antiseptics, including the promotion of wound healing (22),activation of lymphocytes and neutrophils (38), and the lack of significant toxicity to human tissues (39). Sterilization of honey The invaluable assistance of the nursing staff of the Princess Alex- by ␥-irradiation does not cause loss of antimicrobial activity andra Hospital Hemodialysis Unit is gratefully acknowledged. The (40) but is recommended before clinical use because honey has honey used in this trial was provided by Medihoney Pty Ltd.
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Lampbrush Chromosomes of the Chicken: Cytological Maps of Macrobivaients L.A. Chelysheva, I.V. Solovei, A.V. Rodionov, A.F. Yakovlev, E.R. Biological Research Institute. Leningrad University and the All-Union Research Institute of Farm Animal Breeding and Genetics, Leningrad The morphology of lampbrush chromosomes of the chicken has been studied. We identified six pairs of autosome bivalents and the sexual ZW-bivalent. The cytological map of the lampbrush macrobivalents have been constructed.
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