Document Detail

Dead space and paediatric anaesthetic equipment: a physical lung model study.
MedLine Citation:
PMID:  15144302     Owner:  NLM     Status:  MEDLINE    
Untested assumptions have been made with regard to functional dead space in facemasks, filters and breathing systems used in children for the administration of inhalation anaesthesia. Total functional dead space was measured in various combinations of this equipment applied to a spontaneous ventilation lung model with parameter settings appropriate for infants of 7-8 kg. We found that functional dead space was too large to allow for spontaneous ventilation of the lungs when a breathing filter was fitted. There was minimal relationship between size of the facemask and functional dead space; however, the provision of 22-mm female inlets to facemasks achieved proportionately less functional dead space than with 15-mm male inlets. Regardless of the apparatus used and the magnitude of the dead space, the leak induced when a poorly fitting facemask was used dramatically reduced the dead space of the breathing system - to near optimal conditions - by moving the alveolar gas elimination point to within the facemask itself.
D M Miller; A P Adams; D Light
Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Anaesthesia     Volume:  59     ISSN:  0003-2409     ISO Abbreviation:  Anaesthesia     Publication Date:  2004 Jun 
Date Detail:
Created Date:  2004-05-17     Completed Date:  2004-06-21     Revised Date:  2004-11-17    
Medline Journal Info:
Nlm Unique ID:  0370524     Medline TA:  Anaesthesia     Country:  England    
Other Details:
Languages:  eng     Pagination:  600-6     Citation Subset:  AIM; IM    
Guy's, King's and St Thomas' Hospitals School of Medicine, University of London, London, UK.
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MeSH Terms
Anesthesia, Inhalation / instrumentation*
Child, Preschool
Equipment Design
Infant, Newborn
Intubation, Intratracheal / instrumentation
Lung / physiopathology*
Models, Anatomic*
Respiratory Dead Space*
Tidal Volume

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