Document Detail


Measurement of tidal volume using a pneumotachometer during high-frequency oscillation.
MedLine Citation:
PMID:  2344757     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
To assess the accuracy of a pneumotachometer (PN) for tidal volume (VT) measurements during high-frequency oscillation (HFO), we determined simultaneously VT using a PN and a full body plethysmograph (PL) in 12 rabbits. HFO was delivered with an oscillator at a frequency of 10 Hz, mean airway pressure of 8 cm H2O, and inspiratory time of 50%. Pressure amplitude (delta P) was varied as follows: 40, 60, 80, 20, 100, 40 cm H2O. Finally, in ten rabbits a spacer equal in deadspace (VD) to that of the PN (15 ml) was left in-line for 5 min. Blood gases were obtained before and after the spacer was added. We found that VT-PN correlates well with VT-PL (r = .92), although the difference between VT-PN and VT-PL is greater at large VT. Significant respiratory acidosis developed with the spacer in-line. PN may be used to trend VT during HFO but PN must not be left in-line, as increased VD seriously affects ventilation.
Authors:
S E Courtney; K R Weber; W A Spohn; S W Malin; C V Bender; R W Gotshall
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Critical care medicine     Volume:  18     ISSN:  0090-3493     ISO Abbreviation:  Crit. Care Med.     Publication Date:  1990 Jun 
Date Detail:
Created Date:  1990-07-05     Completed Date:  1990-07-05     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0355501     Medline TA:  Crit Care Med     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  651-3     Citation Subset:  AIM; IM    
Affiliation:
Department of Pediatrics, Wright State University, Dayton, OH 45435.
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MeSH Terms
Descriptor/Qualifier:
Animals
High-Frequency Ventilation*
Lung Volume Measurements*
Plethysmography, Whole Body
Rabbits
Respiratory Function Tests / instrumentation*
Tidal Volume*

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


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