title: The antimicrobial effect of Octenidine-dihydrochloride coated polymer tracheotomy tubes on Staphylococcus aureus and Pseudomonas aeruginosa colonisation.
abstract: BACKGROUND
  The surface of polymeric tracheotomy tubes is a favourable environment for biofilm formation and therefore represents a potential risk factor for the development of pneumonia after tracheotomy. The aim of this in-vitro study was to develop octenidine-dihydrochloride (OCT) coated polymer tracheotomy tubes and investigate any effects on Staphylococcus (S.) aureus and Pseudomonas (P.) aeruginosa colonization. Additionally the resistance of the OCT coating was tested using reprocessing procedures like brushing, rinsing and disinfection with glutaraldehyde
  
  
  RESULTS
  Contamination with S. aureus: Before any reprocessing, OCT coated tracheotomy tubes were colonized with 103 cfu/ml and uncoated tracheotomy tubes with 105 cfu/ml (P = 0.045). After reprocessing, no differences in bacterial concentration between modified and conventional tubes were observed.Contamination with P. aeruginosa: Before reprocessing, OCT coated tubes were colonized with 106 cfu/ml and uncoated tubes with 107 cfu/ml (P = 0.006). After reprocessing, no significant differences were observed.
  
  
  CONCLUSIONS
  OCT coating initially inhibits S. aureus and P. aeruginosa colonisation on tracheotomy tubes. This effect, however, vanishes quickly after reprocessing of the tubes due to poor adhesive properties of the antimicrobial compound. Despite the known antimicrobial effect of OCT, its use for antimicrobial coating of tracheotomy tubes is limited unless methods are developed to allow sustained attachment to the tube.
authors.affiliation: Department of Otorhinolaryngology, Head and Neck Surgery, Medical University of Vienna, Vienna, Austria. michaela.zumtobel@meduniwien.ac.at
authors.forename: Michaela
authors.initials: M
authors.lastname: Zumtobel
authors.forename: Ojan
authors.initials: O
authors.lastname: Assadian
authors.forename: Matthias
authors.initials: M
authors.lastname: Leonhard
authors.forename: Maria
authors.initials: M
authors.lastname: Stadler
authors.forename: Berit
authors.initials: B
authors.lastname: Schneider
mesh_terms: D000900:Anti-Bacterial Agents / Q000494:pharmacology*; D018441:Biofilms / Q000187:drug effects / Q000254:growth & development; D020099:Coated Materials, Biocompatible / Q000494:pharmacology*; D015169:Colony Count, Microbial; D004203:Disinfection / Q000379:methods; D004389:Durable Medical Equipment / Q000382:microbiology; D004866:Equipment Contamination; D007097:Imines; D011108:Polymers / Q000494:pharmacology; D011550:Pseudomonas aeruginosa / Q000187:drug effects* / Q000254:growth & development; D011725:Pyridines / Q000494:pharmacology*; D013211:Staphylococcus aureus / Q000187:drug effects* / Q000254:growth & development; D014140:Tracheotomy / Q000295:instrumentation*
chemical_list: D000900:Anti-Bacterial Agents; D020099:Coated Materials, Biocompatible; D007097:Imines; D011108:Polymers; D011725:Pyridines; C034213:octenidine