Surface antimicrobial activity of heparin-bonded and antiseptic-impregnated vascular catheters.
Most Swan-Ganz pulmonary artery catheters have heparin bonded to the surface with benzalkonium chloride, a cationic surfactant, to reduce thrombosis. Since benzalkonium is bactericidal, the antimicrobial activity of heparin-bonded pulmonary artery catheters was investigated in an in vitro assay. Each catheter exhibited activity against a wide variety of potential microbial pathogens, including Candida albicans. The magnitude of activity against individual organisms correlated strongly with their in vitro susceptibility to benzalkonium chloride (r = .94, P < .002). A chlorhexidine-silver sulfadiazine-impregnated catheter exhibited even greater activity than the heparin-bonded catheters (P = .01). When exposed to serum for 24 h, heparin-bonded catheters lost > or = 50% of their antimicrobial activity, whereas the activity of the chlorhexidine-silver sulfadiazine-impregnated catheter was minimally affected. The fortuitous surface antimicrobial activity of heparin-bonded catheters may account for the low incidence of catheter-related bacteremia (mean, 1.0%) compared with Swan-Ganz catheters of the same materials but not coated with benzalkonium-heparin (mean, 2.8%).
Mermel
L A
LA
Department of Medicine, Rhode Island Hospital, Providence 02903.
Stolz
S M
SM
Maki
D G
DG
D001548:Benzalkonium Compounds / Q000494:pharmacology*; D002176:Candida albicans / Q000187:drug effects; D002407:Catheterization, Swan-Ganz / Q000295:instrumentation*; D002710:Chlorhexidine / Q000494:pharmacology; D006493:Heparin / Q000494:pharmacology*; D007711:Klebsiella pneumoniae / Q000187:drug effects; D008826:Microbial Sensitivity Tests; D011550:Pseudomonas aeruginosa / Q000187:drug effects; D012837:Silver Sulfadiazine / Q000494:pharmacology
D001548:Benzalkonium Compounds; D006493:Heparin; D002710:Chlorhexidine; D012837:Silver Sulfadiazine