Assessment of the variability of airborne contamination levels in an intensive care unit over a 24 hour period

M Booth, L Dougall, E Khoo, H Hood, S MacGregor, M MacLean

Research output: Contribution to conferencePoster

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Abstract

Introduction: The objective of this study was to evaluate the variability in the dynamics and levels of airborne contamination within a hospital ICU in order to establish an improved understanding of the extent to which airborne bioburden contributes to cross-infection of patients. Microorganisms from the respiratory tract or skin can become airborne by coughing, sneezing and periods of increased activity such as bed changes and staff rounds. Current knowledge of the clinical microflora is limited however it is estimated that 10-33% of nosocomial infections are transmitted via air.

Methods: Environmental air monitoring was conducted in Glasgow Royal Infirmary ICU, in the open ward and in patient isolation rooms. A sieve impactor air sampler was used to collect 500 L air samples every 15 minutes over 10 hour (08:00-18:00 h) and 24 hour (08:00-08:00 h) periods. Samples were collected, room activity logged and the bacterial contamination levels were recorded as CFU/m3 of air.

Results: A high degree of variability in levels of airborne contamination was observed over the course of a 10 hour day and a 24 period in a hospital ICU. Counts ranged from 12-510 CFU/m3 over 24 hours in an isolation room occupied for 10 days by a patient with C. difficile infection. Contamination levels were found to be lowest during the night and in unoccupied rooms, with an average value of 20 CFU/m3. Peaks in airborne contamination showed a direct relation to an increase in room activity.

Conclusions: This study demonstrates the degree of airborne contamination that can occur in an ICU over a 24 hour period. Numerous factors were found to contribute to microbial air contamination and consideration should be given to potential improved infection control strategies and decontamination technologies which could be deployed within the clinical environment to reduce the airborne contamination levels, with the ultimate aim of reducing healthcare-associated infections from environmental sources.
Original languageEnglish
Number of pages1
Publication statusPublished - 20 Mar 2018
Event38th International Symposium on Intensive Care and Emergency Medicine - Square Brussels Meeting Centre , Brussels , Belgium
Duration: 20 Mar 201823 Mar 2018

Conference

Conference38th International Symposium on Intensive Care and Emergency Medicine
CountryBelgium
CityBrussels
Period20/03/1823/03/18

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Intensive care units
Contamination
Air
Sieves
Decontamination
Microorganisms
Skin
Monitoring

Keywords

  • airborne contamination
  • hospitals
  • intensive care units
  • air monitoring

Cite this

Booth, M., Dougall, L., Khoo, E., Hood, H., MacGregor, S., & MacLean, M. (2018). Assessment of the variability of airborne contamination levels in an intensive care unit over a 24 hour period. Poster session presented at 38th International Symposium on Intensive Care and Emergency Medicine, Brussels , Belgium.
Booth, M ; Dougall, L ; Khoo, E ; Hood, H ; MacGregor, S ; MacLean, M. / Assessment of the variability of airborne contamination levels in an intensive care unit over a 24 hour period. Poster session presented at 38th International Symposium on Intensive Care and Emergency Medicine, Brussels , Belgium.1 p.
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abstract = "Introduction: The objective of this study was to evaluate the variability in the dynamics and levels of airborne contamination within a hospital ICU in order to establish an improved understanding of the extent to which airborne bioburden contributes to cross-infection of patients. Microorganisms from the respiratory tract or skin can become airborne by coughing, sneezing and periods of increased activity such as bed changes and staff rounds. Current knowledge of the clinical microflora is limited however it is estimated that 10-33{\%} of nosocomial infections are transmitted via air. Methods: Environmental air monitoring was conducted in Glasgow Royal Infirmary ICU, in the open ward and in patient isolation rooms. A sieve impactor air sampler was used to collect 500 L air samples every 15 minutes over 10 hour (08:00-18:00 h) and 24 hour (08:00-08:00 h) periods. Samples were collected, room activity logged and the bacterial contamination levels were recorded as CFU/m3 of air. Results: A high degree of variability in levels of airborne contamination was observed over the course of a 10 hour day and a 24 period in a hospital ICU. Counts ranged from 12-510 CFU/m3 over 24 hours in an isolation room occupied for 10 days by a patient with C. difficile infection. Contamination levels were found to be lowest during the night and in unoccupied rooms, with an average value of 20 CFU/m3. Peaks in airborne contamination showed a direct relation to an increase in room activity. Conclusions: This study demonstrates the degree of airborne contamination that can occur in an ICU over a 24 hour period. Numerous factors were found to contribute to microbial air contamination and consideration should be given to potential improved infection control strategies and decontamination technologies which could be deployed within the clinical environment to reduce the airborne contamination levels, with the ultimate aim of reducing healthcare-associated infections from environmental sources.",
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Booth, M, Dougall, L, Khoo, E, Hood, H, MacGregor, S & MacLean, M 2018, 'Assessment of the variability of airborne contamination levels in an intensive care unit over a 24 hour period' 38th International Symposium on Intensive Care and Emergency Medicine, Brussels , Belgium, 20/03/18 - 23/03/18, .

Assessment of the variability of airborne contamination levels in an intensive care unit over a 24 hour period. / Booth, M; Dougall, L; Khoo, E; Hood, H; MacGregor, S; MacLean, M.

2018. Poster session presented at 38th International Symposium on Intensive Care and Emergency Medicine, Brussels , Belgium.

Research output: Contribution to conferencePoster

TY - CONF

T1 - Assessment of the variability of airborne contamination levels in an intensive care unit over a 24 hour period

AU - Booth, M

AU - Dougall, L

AU - Khoo, E

AU - Hood, H

AU - MacGregor, S

AU - MacLean, M

PY - 2018/3/20

Y1 - 2018/3/20

N2 - Introduction: The objective of this study was to evaluate the variability in the dynamics and levels of airborne contamination within a hospital ICU in order to establish an improved understanding of the extent to which airborne bioburden contributes to cross-infection of patients. Microorganisms from the respiratory tract or skin can become airborne by coughing, sneezing and periods of increased activity such as bed changes and staff rounds. Current knowledge of the clinical microflora is limited however it is estimated that 10-33% of nosocomial infections are transmitted via air. Methods: Environmental air monitoring was conducted in Glasgow Royal Infirmary ICU, in the open ward and in patient isolation rooms. A sieve impactor air sampler was used to collect 500 L air samples every 15 minutes over 10 hour (08:00-18:00 h) and 24 hour (08:00-08:00 h) periods. Samples were collected, room activity logged and the bacterial contamination levels were recorded as CFU/m3 of air. Results: A high degree of variability in levels of airborne contamination was observed over the course of a 10 hour day and a 24 period in a hospital ICU. Counts ranged from 12-510 CFU/m3 over 24 hours in an isolation room occupied for 10 days by a patient with C. difficile infection. Contamination levels were found to be lowest during the night and in unoccupied rooms, with an average value of 20 CFU/m3. Peaks in airborne contamination showed a direct relation to an increase in room activity. Conclusions: This study demonstrates the degree of airborne contamination that can occur in an ICU over a 24 hour period. Numerous factors were found to contribute to microbial air contamination and consideration should be given to potential improved infection control strategies and decontamination technologies which could be deployed within the clinical environment to reduce the airborne contamination levels, with the ultimate aim of reducing healthcare-associated infections from environmental sources.

AB - Introduction: The objective of this study was to evaluate the variability in the dynamics and levels of airborne contamination within a hospital ICU in order to establish an improved understanding of the extent to which airborne bioburden contributes to cross-infection of patients. Microorganisms from the respiratory tract or skin can become airborne by coughing, sneezing and periods of increased activity such as bed changes and staff rounds. Current knowledge of the clinical microflora is limited however it is estimated that 10-33% of nosocomial infections are transmitted via air. Methods: Environmental air monitoring was conducted in Glasgow Royal Infirmary ICU, in the open ward and in patient isolation rooms. A sieve impactor air sampler was used to collect 500 L air samples every 15 minutes over 10 hour (08:00-18:00 h) and 24 hour (08:00-08:00 h) periods. Samples were collected, room activity logged and the bacterial contamination levels were recorded as CFU/m3 of air. Results: A high degree of variability in levels of airborne contamination was observed over the course of a 10 hour day and a 24 period in a hospital ICU. Counts ranged from 12-510 CFU/m3 over 24 hours in an isolation room occupied for 10 days by a patient with C. difficile infection. Contamination levels were found to be lowest during the night and in unoccupied rooms, with an average value of 20 CFU/m3. Peaks in airborne contamination showed a direct relation to an increase in room activity. Conclusions: This study demonstrates the degree of airborne contamination that can occur in an ICU over a 24 hour period. Numerous factors were found to contribute to microbial air contamination and consideration should be given to potential improved infection control strategies and decontamination technologies which could be deployed within the clinical environment to reduce the airborne contamination levels, with the ultimate aim of reducing healthcare-associated infections from environmental sources.

KW - airborne contamination

KW - hospitals

KW - intensive care units

KW - air monitoring

UR - https://www.intensive.org/1/main.asp

M3 - Poster

ER -

Booth M, Dougall L, Khoo E, Hood H, MacGregor S, MacLean M. Assessment of the variability of airborne contamination levels in an intensive care unit over a 24 hour period. 2018. Poster session presented at 38th International Symposium on Intensive Care and Emergency Medicine, Brussels , Belgium.