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Portable lung ventilators: the potential risk from bacterial colonisation
Abstract:
Seven portable lung ventilators were investigated to assess the risk of bacterial colonization of the ventilator valve. One valve was deliberately contaminated with Serratia marcescens and the survival of organisms within the valve studied. Periods of colonization by Acinetobacter were found in all the hospital ventilators studied but none of those from the ambulance service. The potential risk to the patient from this organism is discussed and the importance of adequate storage and regular cleaning of the ventilator valve emphasised. Since humidification of the patients inspired gas during transfer is desirable, the use of a combined heat and moisture exchanger and microbiological filter would appear advisable.
Insights
Hospital ventilators pose a bacterial colonization risk. Regular cleaning and proper storage of ventilator valves are crucial to prevent Acinetobacter infections in patients.
Area of Science:
- Microbiology
- Medical Devices
- Infectious Disease Prevention
Background:
- Portable lung ventilators are essential for patient respiratory support during transport.
- The risk of bacterial contamination within ventilator valves is a significant concern for patient safety.
- Acinetobacter species are opportunistic pathogens that can cause hospital-acquired infections.
Purpose of the Study:
- To investigate the risk of bacterial colonization in portable lung ventilator valves.
- To assess the survival of Serratia marcescens within a ventilator valve.
- To identify bacterial presence in hospital versus ambulance service ventilators.
Main Methods:
- Seven portable lung ventilators were examined for bacterial colonization.
- One ventilator valve was experimentally contaminated with Serratia marcescens to study organism survival.
- Ventilator valves from hospital and ambulance services were compared for Acinetobacter presence.
Main Results:
- Acinetobacter colonization was detected in all hospital-use ventilators studied.
- No Acinetobacter colonization was found in ventilators from ambulance services.
- Serratia marcescens survival within the valve was assessed post-contamination.
Conclusions:
- Hospital ventilators pose a risk of Acinetobacter colonization, potentially endangering patients.
- Adequate storage and regular cleaning of ventilator valves are critical for infection control.
- Using a combined heat and moisture exchanger with a microbiological filter is recommended for humidification during patient transfer.