Bactericidal effects of silver plus titanium dioxide-coated endotracheal tubes on Pseudomonas aeruginosa and...

Area of Science:

• Biomaterials science
• Infectious disease research
• Medical device coatings

Background:

• Ventilator-associated pneumonia (VAP) is a serious hospital-acquired infection with high morbidity and mortality.
• Pseudomonas aeruginosa (P. aeruginosa) and Staphylococcus aureus (S. aureus) are key pathogens implicated in VAP.
• Silver (Ag) coatings on endotracheal tubes (ETTs) are known to reduce bacterial colonization, but titanium dioxide (TiO(2)) coatings have not been extensively studied.

Purpose of the Study:

• To investigate the efficacy of various TiO(2)-based coatings, with and without Ag, on ETTs against P. aeruginosa and S. aureus colonization.
• To evaluate the potential of novel ETT coatings in preventing VAP.

Main Methods:

• Five types of ETT coatings were applied over a silica layer: Ag, solgel TiO(2), solgel TiO(2) with Ag, Degussa P25 TiO(2), and Degussa TiO(2) with Ag.
• ETTs were incubated with P. aeruginosa or S. aureus.
• Bacterial colonization was quantitatively assessed over 5 days.

Main Results:

• Both P. aeruginosa and S. aureus grew on standard ETTs over 5 days.
• Solgel TiO(2) with Ag significantly inhibited P. aeruginosa growth at 24 hours.
• Degussa TiO(2) with Ag significantly inhibited P. aeruginosa growth at 24 and 48 hours.
• No significant difference in S. aureus growth was observed for any coating compared to controls.

Conclusions:

• Combined solgel TiO(2) with Ag and Degussa TiO(2) with Ag coatings effectively reduced P. aeruginosa colonization in vitro.
• These TiO(2)-Ag coatings showed no significant impact on S. aureus colonization.
• Further research, potentially including UV light, is required to explore the utility of these coatings in VAP prevention.