Document Detail

Inspiration: expiration ratio. Is mean airway pressure the difference?
MedLine Citation:
PMID:  7028397     Owner:  NLM     Status:  MEDLINE    
Mechanical ventilation with different ratios of inspiratory to expiratory times (I:E ratio) and levels of positive end-expiratory pressure (PEEP) were applied to 9 dogs after the aspiration of fresh water and then were compared. The dogs were ventilated with an I:E ratio of 2:1 with 0 PEEP; an I:E ratio of 2:1 with 5 torr PEEP; and an I:E ratio of 1:2 with 5 torr PEEP. Peak airway pressures were regulated to maintain a mean airway pressure of 13 mm Hg. Arterial oxygenation was better with an I:E ratio of 1:2 with PEEP than with an I:E ratio of 2:1 either with or without PEEP (60 +/- 15 torr as compared with 42 +/- 11 torr and 43 +/- 10 torr). Cardiac index was depressed with all ventilatory modes, but oxygen delivery did not significantly differ among all the modes of ventilation. A ratio of prolonged I:E was not seen to benefit blood gas tension.
L S Berman; J B Downs; A Van Eeden; D Delhagen
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Critical care medicine     Volume:  9     ISSN:  0090-3493     ISO Abbreviation:  Crit. Care Med.     Publication Date:  1981 Nov 
Date Detail:
Created Date:  1982-01-28     Completed Date:  1982-01-28     Revised Date:  2003-11-14    
Medline Journal Info:
Nlm Unique ID:  0355501     Medline TA:  Crit Care Med     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  775-7     Citation Subset:  AIM; IM    
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MeSH Terms
Airway Resistance*
Atmospheric Pressure
Cardiac Output
Hydrogen-Ion Concentration
Oxygen / blood
Partial Pressure
Positive-Pressure Respiration / methods*
Respiration, Artificial / methods*
Reg. No./Substance:

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