Document Detail

The importance of the balloon reservoir volume of a CPAP system in reducing the work of breathing.
MedLine Citation:
PMID:  3090127     Owner:  NLM     Status:  MEDLINE    
We have previously reported, that the work of breathing in spontaneously breathing patients on CPAP could be significantly reduced by increasing the volume of the balloon reservoir in the circuit of a CPAP system from 3 to 23 l. We now report a study designed to determine the optimum balloon reservoir volume for the minimization of the work of breathing. Twenty intubated, spontaneously breathing patients were connected to a CPAP system with interchangeable balloon reservoirs. In each patient the work of breathing was measured for reservoir volumes of 3, 6, 12, 18, and 24 l attached in random order, while the positive airway pressure was held constant at 10 cm H2O. The balloons were constructed of the same material and had similar compliance. Rebreathing was prevented with use of one-way valves. Significant (p less than 0.001) decreases in the work of breathing were found on increasing reservoir volumes from 3 to 6, 6 to 12, and 12 to 18 l. A less significant (p less than 0.01) decrease in the work of breathing was found between reservoirs of 18 and 24 l. Rebreathing did not occur with significantly (p less than 0.001) lower flow rates when large reservoirs were used. We conclude that a balloon reservoir of 18 l represents the best compromise between reduction in the work of breathing, utilization of low source flow, and convenience of clinical use.
Z H Bshouty; J Roeseler; M S Reynaert; D Rodenstein
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Publication Detail:
Type:  Clinical Trial; Journal Article; Randomized Controlled Trial    
Journal Detail:
Title:  Intensive care medicine     Volume:  12     ISSN:  0342-4642     ISO Abbreviation:  Intensive Care Med     Publication Date:  1986  
Date Detail:
Created Date:  1986-09-23     Completed Date:  1986-09-23     Revised Date:  2004-11-17    
Medline Journal Info:
Nlm Unique ID:  7704851     Medline TA:  Intensive Care Med     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  153-6     Citation Subset:  IM    
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MeSH Terms
Carbon Dioxide / blood
Equipment Design
Oxygen / blood
Positive-Pressure Respiration / instrumentation*
Work of Breathing*
Reg. No./Substance:
124-38-9/Carbon Dioxide; 7782-44-7/Oxygen

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

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