Document Detail

Distribution of expiratory gas and rebreathing in T-piece modifications used in weaning.
MedLine Citation:
PMID:  6421079     Owner:  NLM     Status:  MEDLINE    
The simple T-piece is frequently used as a weaning system during respirator treatment. It is modified with an expiratory non-compliant reservoir (EnCR), an inspiratory compliant reservoir (ICR) and/or an expiratory one-way valve. The distribution of expiratory gases and rebreathing were studied in a model set-up in the corresponding systems at different fresh gas flows (FGF) and tidal volumes (VT). An EnCR produces no change, whereas an ICR causes the expiratory gas to flow into the inspiratory limb, an effect which is intensified by the presence of an expiratory valve. With a falling FGF and a rising VT, increasing amounts of expiratory gas are found in the inspiratory limb in the modifications with an ICR. However, this gives rise to rebreathing in the valve modification with a low FGF and high VT. The modification of the T-piece with an ICR but without a one-way valve is advantageous, as this system combines only slight dilution via the expiratory limb and a minimal risk of rebreathing.
F Hartmann-Andersen; P K Andersen; J E Olsen; J Jakubaszko
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Publication Detail:
Type:  Comparative Study; Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Acta anaesthesiologica Scandinavica     Volume:  27     ISSN:  0001-5172     ISO Abbreviation:  Acta Anaesthesiol Scand     Publication Date:  1983 Dec 
Date Detail:
Created Date:  1984-03-06     Completed Date:  1984-03-06     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0370270     Medline TA:  Acta Anaesthesiol Scand     Country:  DENMARK    
Other Details:
Languages:  eng     Pagination:  501-4     Citation Subset:  IM    
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MeSH Terms
Breath Tests
Carbon Dioxide / analysis*
Protective Devices*
Respiratory Protective Devices*
Tidal Volume
Ventilators, Mechanical*
Reg. No./Substance:
124-38-9/Carbon Dioxide

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