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Title:Detection and quantification of exhaled volatile organic compounds in mechanically ventilated patients–comparison of two sampling methods
Authors:ID White, Iain R., Laboratory for Environmental and Life Sciences, University of Nova Gorica, Nova Gorica, Slovenia (Author)
ID Oort, Pouline M. van, Department of Intensive Care, Amsterdam UMC – location Academic Medical Centre (AMC), Amsterdam, the Netherlands (Author)
ID Ahmed, Waqar, Manchester Institute of Biotechnology, University of Manchester, Manchester, UK (Author)
ID Johnson, Craig, Manchester Institute of Biotechnology, University of Manchester, Manchester, UK (Author)
ID Bannard-Smith, Jonathan, Manchester Academic Health Science Centre, Manchester University Hospitals NHS Foundation Trust, Manchester, UK. (Author)
ID Felton, Timothy, Manchester Academic Health Science Centre, Manchester University Hospitals NHS Foundation Trust, Manchester, UK (Author)
ID Bos, Lieuwe D., Department of Intensive Care, Amsterdam UMC – location Academic Medical Centre (AMC), Amsterdam, the Netherlands (Author)
ID Goodacre, Royston, Department of Biochemistry, Institute of Integrative Biology, University of Liverpool, UK (Author)
ID Dark, Paul, Manchester Academic Health Science Centre, Manchester University Hospitals NHS Foundation Trust, Manchester, UK (Author)
ID Fowler, Stephen J., Manchester Academic Health Science Centre, Manchester University Hospitals NHS Foundation Trust, Manchester, UK (Author)
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Language:English
Work type:Not categorized
Typology:1.01 - Original Scientific Article
Organization:UNG - University of Nova Gorica
Abstract:Exhaled breath analysis is a promising new diagnostic tool, but currently no standardised method for sampling is available in mechanically ventilated patients. We compared two breath sampling methods, first using an artificial ventilator circuit, then in “real life” in mechanically ventilated patients on the intensive care unit. In the laboratory circuit, a 24-component synthetic-breath volatile organic compound (VOC) mixture was injected into the system as air was sampled: (A) through a port on the exhalation limb of the circuit and (B) through a closed endo-bronchial suction catheter. Sorbent tubes were used to collect samples for analysis by thermal desorption-gas chromatography-mass spectrometry. Realistic mechanical ventilation rates and breath pressure–volume loops were established and method detection limits (MDLs) were calculated for all VOCs. Higher yields of VOCs were retrieved using the closed suction catheter; however, for several VOCs MDLs were compromised due to the background signal associated with plastic and rubber components in the catheters. Different brands of suction catheter were compared. Exhaled VOC data from 40 patient samples collected at two sites were then used to calculate the proportion of data analysed above the MDL. The relative performance of the two methods differed depending on the VOC under study and both methods showed sensitivity towards different exhaled VOCs. Furthermore, method performance differed depending on recruitment site, as the centres were equipped with different brands of respiratory equipment, an important consideration for the design of multicentre studies investigating exhaled VOCs in mechanically ventilated patients.
Keywords:Volatile organic compounds, infection, breath, ventilator associated pneumonia
Year of publishing:2020
Number of pages:10
Numbering:online
PID:20.500.12556/RUNG-5987 New window
COBISS.SI-ID:42126339 New window
DOI:DOI: 10.1039/c9an01134j New window
NUK URN:URN:SI:UNG:REP:30UP2PTT
Publication date in RUNG:10.12.2020
Views:2566
Downloads:0
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Record is a part of a journal

Title:Analyst
Publisher:Royal society of Chemistry
Year of publishing:2020
ISSN:1364-5528

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