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Microbial inactivation properties of a new antimicrobial/antithrombotic catheter lock solution (citrate/methylene blue/parabens).

Steczko J, Ash SR, Nivens DE, Brewer L, Winger RK - Nephrol. Dial. Transplant. (2009)

Bottom Line: These effects were compared to the antimicrobial properties of heparin at 2500 units/ml.In contrast, heparin had a minimal effect on planktonic or biofilm organisms.The tested catheter lock may have usefulness in preventing bacterial colonization of haemodialysis catheters and diminishing the incidence of catheter-related bacteraemia.

View Article: PubMed Central - PubMed

Affiliation: R&D, Ash Access Technology, Inc., Lafayette, IN, USA. jsteczko@ashaccess.com

ABSTRACT

Background: Microbial infections are the most serious complications associated with indwelling central venous catheters. A catheter lock solution that is both antibacterial and antithrombotic is needed. The goal of this study was to determine whether a new catheter lock solution containing citrate, methylene blue and parabens has antimicrobial properties against planktonic bacteria and against sessile bacteria within a biofilm. These effects were compared to the antimicrobial properties of heparin at 2500 units/ml.

Methods: The tested solution (C/MB/P comprising 7% sodium citrate, 0.05% methylene blue and 0.165% parabens) and individual components were challenged against gram-positive and gram-negative organisms and fungi. Control solutions were heparin with preservatives. Studies included evaluation of eradication of planktonic bacteria and sessile organisms in a biofilm grown on polymeric and glass coupons. Biofilm samples were inspected by scanning electron microscopy, atomic force microscopy and vital stains.

Results: The C/MB/P solution, contrary to heparin, kills most tested planktonic microorganisms within 1 h of incubation. All tested organisms have an MIC of 25% or less of the original concentration of a new catheter lock. Bacteria strains did not develop resistance over more than 40 passages of culture suspensions. The C/MB/P solution is able to kill nearly all sessile bacteria in biofilm growth on plastic or glass discs in 1 h. Microscopic methods demonstrated extensive physical elimination of biofilm deposits from treated coupons. In contrast, heparin had a minimal effect on planktonic or biofilm organisms.

Conclusions: The new multicomponent lock solution has strong antimicrobial properties against both planktonic and sessile microorganisms. By comparison, heparin with preservative has weak antibacterial properties against planktonic and biofilm bacteria. The tested catheter lock may have usefulness in preventing bacterial colonization of haemodialysis catheters and diminishing the incidence of catheter-related bacteraemia.

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Related in: MedlinePlus

MIC of C/MB/P versus several pathogens (ATCC and hospital isolates) expressed as % of the original concentration.
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Figure 3: MIC of C/MB/P versus several pathogens (ATCC and hospital isolates) expressed as % of the original concentration.

Mentions: As can be seen from Figure 3, all tested organisms have an MIC of 25% or less of the original concentration. Tested bacteria did not develop resistance above this earlier determined MIC over a long period of time. Figure 4 represents the first 40 days of the resistance development studies with examples of gram-positive and gram-negative strains. Both experiments indicate the high level of effectiveness of this new lock solution in eliminating microorganisms and thereby preventing catheter colonization with planktonic microorganisms.


Microbial inactivation properties of a new antimicrobial/antithrombotic catheter lock solution (citrate/methylene blue/parabens).

Steczko J, Ash SR, Nivens DE, Brewer L, Winger RK - Nephrol. Dial. Transplant. (2009)

MIC of C/MB/P versus several pathogens (ATCC and hospital isolates) expressed as % of the original concentration.
© Copyright Policy - creative-commons
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC2684753&req=5

Figure 3: MIC of C/MB/P versus several pathogens (ATCC and hospital isolates) expressed as % of the original concentration.
Mentions: As can be seen from Figure 3, all tested organisms have an MIC of 25% or less of the original concentration. Tested bacteria did not develop resistance above this earlier determined MIC over a long period of time. Figure 4 represents the first 40 days of the resistance development studies with examples of gram-positive and gram-negative strains. Both experiments indicate the high level of effectiveness of this new lock solution in eliminating microorganisms and thereby preventing catheter colonization with planktonic microorganisms.

Bottom Line: These effects were compared to the antimicrobial properties of heparin at 2500 units/ml.In contrast, heparin had a minimal effect on planktonic or biofilm organisms.The tested catheter lock may have usefulness in preventing bacterial colonization of haemodialysis catheters and diminishing the incidence of catheter-related bacteraemia.

View Article: PubMed Central - PubMed

Affiliation: R&D, Ash Access Technology, Inc., Lafayette, IN, USA. jsteczko@ashaccess.com

ABSTRACT

Background: Microbial infections are the most serious complications associated with indwelling central venous catheters. A catheter lock solution that is both antibacterial and antithrombotic is needed. The goal of this study was to determine whether a new catheter lock solution containing citrate, methylene blue and parabens has antimicrobial properties against planktonic bacteria and against sessile bacteria within a biofilm. These effects were compared to the antimicrobial properties of heparin at 2500 units/ml.

Methods: The tested solution (C/MB/P comprising 7% sodium citrate, 0.05% methylene blue and 0.165% parabens) and individual components were challenged against gram-positive and gram-negative organisms and fungi. Control solutions were heparin with preservatives. Studies included evaluation of eradication of planktonic bacteria and sessile organisms in a biofilm grown on polymeric and glass coupons. Biofilm samples were inspected by scanning electron microscopy, atomic force microscopy and vital stains.

Results: The C/MB/P solution, contrary to heparin, kills most tested planktonic microorganisms within 1 h of incubation. All tested organisms have an MIC of 25% or less of the original concentration of a new catheter lock. Bacteria strains did not develop resistance over more than 40 passages of culture suspensions. The C/MB/P solution is able to kill nearly all sessile bacteria in biofilm growth on plastic or glass discs in 1 h. Microscopic methods demonstrated extensive physical elimination of biofilm deposits from treated coupons. In contrast, heparin had a minimal effect on planktonic or biofilm organisms.

Conclusions: The new multicomponent lock solution has strong antimicrobial properties against both planktonic and sessile microorganisms. By comparison, heparin with preservative has weak antibacterial properties against planktonic and biofilm bacteria. The tested catheter lock may have usefulness in preventing bacterial colonization of haemodialysis catheters and diminishing the incidence of catheter-related bacteraemia.

Show MeSH
Related in: MedlinePlus