| In vitro validation of a Pitot-based flow meter for the measurement of respiratory volume and flow in large animal anaesthesia. | |
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MedLine Citation:
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PMID: 19397772 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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OBJECTIVE: To remodel and validate commercially available monitors and their Pitot tube-based flow sensors for use in large animals, using in vitro techniques. STUDY DESIGN: Prospective, in vitro experiment. METHODS: Both the original and the remodelled sensor were studied with a reference flow generator. Measurements were taken of the static flow-pressure relationship and linearity of the flow signal. Sensor airway resistance was calculated. Following recalibration of the host monitor, volumes ranging from 1 to 7 L were generated by a calibration syringe, and bias and precision of spirometric volume was determined. Where manual recalibration was not available, a conversion factor for volume measurement was determined. The influence of gas composition mixture and peak flow on the conversion factor was studied. RESULTS: Both the original and the remodelled sensor showed similar static flow-pressure relationships and linearity of the flow signal. Mean bias (%) of displayed values compared with the reference volume of 3, 5 and 7 L varied between -0.4% and +2.4%, and this was significantly smaller than that for 1 L (4.8% to +5.0%). Conversion factors for 3, 5 and 7 L were very similar (mean 6.00 +/- 0.2, range 5.91-6.06) and were not significantly influenced by the gas mixture used. Increasing peak flow caused a small decrease in the conversion factor. Volume measurement error and conversion factors for inspiration and expiration were close to identity. CONCLUSION: The combination of the host monitor with the remodelled flow sensor allowed accurate in vitro measurement of flows and volumes in a range expected during large animal anaesthesia. CLINICAL RELEVANCE: This combination has potential as a reliable spirometric monitor for use during large animal anaesthesia. |
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Authors:
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Yves P S Moens; Peter Gootjes; Jean-Claude Ionita; Erkki Heinonen; Urs Schatzmann |
Publication Detail:
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Type: Journal Article |
Journal Detail:
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Title: Veterinary anaesthesia and analgesia Volume: 36 ISSN: 1467-2995 ISO Abbreviation: Vet Anaesth Analg Publication Date: 2009 May |
Date Detail:
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Created Date: 2009-04-28 Completed Date: 2009-06-17 Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 100956422 Medline TA: Vet Anaesth Analg Country: England |
Other Details:
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Languages: eng Pagination: 209-19 Citation Subset: IM |
Affiliation:
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Clinic of Anaesthesiology and Perioperative Intensive Care, University of Veterinary Medicine, Vienna, Austria. yves.moens@vu-wien.ac.at |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Anesthesia, Inhalation
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instrumentation,
veterinary* Animals Lung Volume Measurements / instrumentation, veterinary* Monitoring, Physiologic / instrumentation, veterinary* Respiration, Artificial / instrumentation, veterinary* |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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