Antimicrobial-coated endotracheal tubes: an experimental study

Area of Science:

• Medical Devices
• Infectious Diseases
• Biomaterials

Background:

• Antibiotic-resistant bacterial biofilm formation on endotracheal tubes (ETTs) can lead to pneumonia.
• Developing effective antibacterial coatings for ETTs is crucial for preventing device-associated infections.

Purpose of the Study:

• To develop and evaluate antibacterial-coated ETTs for preventing bacterial colonization.
• To assess the efficacy of silver sulfadiazine-coated ETTs (SSD-ETT) against Pseudomonas aeruginosa.

Main Methods:

• In vitro testing of various coated ETTs, followed by detailed evaluation of SSD-ETT against P. aeruginosa for up to 72 hours.
• An animal study involving sheep randomized to receive either SSD-ETT or standard ETT (St-ETT) during 24-hour mechanical ventilation.
• Microbiological studies, scanning electron microscopy, and confocal microscopy were used for evaluation.

Main Results:

• In vitro: SSD-ETT remained bacteria-free for 72 hours, while St-ETT showed significant P. aeruginosa growth and biofilm.
• In vivo: SSD-ETT group had no bacterial growth in ETT, ventilator tubing, or lower respiratory tract.
• Control St-ETT group exhibited heavy colonization in ETT, ventilator tubing, and lower respiratory tract.

Conclusions:

• Several antibacterial coatings for ETTs demonstrate effectiveness and durability.
• SSD-ETT effectively prevents P. aeruginosa biofilm formation in vitro.
• SSD-ETT significantly reduces lower respiratory tract colonization in mechanically ventilated sheep.