Document Detail

Inter-machine variability in the stability of continuous positive airway pressure.
MedLine Citation:
PMID:  1612159     Owner:  NLM     Status:  MEDLINE    
Two studies were performed to investigate the differences in pressure stability performance of the continuous positive airway pressure (CPAP) machines used by our patients. The variations of mask pressures during each respiratory cycle were measured during overnight studies of two groups of patients with obstructive sleep apnoea, who were using either a Sleep-Easy III CPAP machine or a Si-Plan CPAP unit. The patients were well-matched for age, weight and neck circumference. The group using the Si-Plan unit had more constant mask pressures and were using lower CPAP pressures (mean 10.6 cmH2O) than those using the Sleep-Easy III machine (mean 13.8 cmH2O) (p less than 0.02). The pressure stability performance of five CPAP machines used by our patients was also compared using standardized simulated patient breaths produced by a negative pressure cuirass pump. There were large differences between the machines in ability to maintain a constant pressure. Using a tidal volume of 0.5 l and peak flow rates of between 20-40 l.min-1 the pressure variation ranged from 0-67% of the minimum inspiratory pressure. The maintenance of a constant pressure during inspiration and expiration lowers the mean pressure required to eliminate obstructive sleep apnoeas and reduces the likelihood of pressure related side-effects.
M Jackson; M A King; J M Shneerson
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  The European respiratory journal     Volume:  5     ISSN:  0903-1936     ISO Abbreviation:  Eur. Respir. J.     Publication Date:  1992 May 
Date Detail:
Created Date:  1992-07-30     Completed Date:  1992-07-30     Revised Date:  2013-05-23    
Medline Journal Info:
Nlm Unique ID:  8803460     Medline TA:  Eur Respir J     Country:  DENMARK    
Other Details:
Languages:  eng     Pagination:  587-91     Citation Subset:  IM    
Assisted Ventilation Unit, Papworth Hospital, Cambridge, UK.
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MeSH Terms
Middle Aged
Positive-Pressure Respiration / instrumentation*
Respiratory Mechanics
Sleep Apnea Syndromes / therapy*

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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