| Inspiratory valve malfunction in a circle system: pitfalls in capnography. | |
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MedLine Citation:
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PMID: 1451230 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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Capnography is a useful technique in monitoring the integrity of anaesthetic equipment such as the malfunctioning of unidirectional valves in circle system. However, the lack of a precise mechanism in existing capnographs to identify the start of inspiration and the beginning of expiration in the capnograms, makes the analysis of the carbon dioxide waveforms during inspiration difficult and thus results in inaccurate assessment of rebreathing. We report a case where, during the malfunction of the inspiratory unidirectional valve in the circle system, the capnograph failed to detect the presence of substantial rebreathing. Critical analysis of the capnogram recorded during the malfunction revealed that there was substantial rebreathing which was underestimated by the capnograph as it reports only the lowest CO2 concentration rebreathed during inspiration in such abnormal situations. |
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Authors:
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A Y Kumar; K Bhavani-Shankar; H S Moseley; Y Delph |
Publication Detail:
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Type: Case Reports; Journal Article |
Journal Detail:
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Title: Canadian journal of anaesthesia = Journal canadien d'anesthésie Volume: 39 ISSN: 0832-610X ISO Abbreviation: Can J Anaesth Publication Date: 1992 Nov |
Date Detail:
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Created Date: 1992-12-31 Completed Date: 1992-12-31 Revised Date: 2004-11-17 |
Medline Journal Info:
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Nlm Unique ID: 8701709 Medline TA: Can J Anaesth Country: CANADA |
Other Details:
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Languages: eng Pagination: 997-9 Citation Subset: IM |
Affiliation:
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Department of Anaesthesia, Queen Elizabeth Hospital, University of West Indies, Faculty of Medical Sciences, Barbados. |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Anesthesia, Closed-Circuit
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adverse effects*,
instrumentation* Carbon Dioxide / analysis* Equipment Failure Female Humans Inhalation Middle Aged Monitoring, Physiologic / instrumentation, methods* Pressure Pulmonary Ventilation / physiology Respiration, Artificial Tidal Volume |
| Chemical | |
Reg. No./Substance:
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124-38-9/Carbon Dioxide |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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