Document Detail

Duration of carbon dioxide absorption by soda lime at low rates of fresh gas flow.
MedLine Citation:
PMID:  1903949     Owner:  NLM     Status:  MEDLINE    
STUDY OBJECTIVE: To determine the impact of a low fresh gas flow rate on the duration of carbon dioxide (CO2) absorption by soda lime. DESIGN: Nonclinical, experimental. SETTING: Experimental laboratory. METHODS: In vitro test with Sodasorb and a semiclosed breathing circle ventilating a test lung with a CO2 inflow of 250 ml per minute. Fresh gas flow rates of 0.25, 0.5, 1, 2, and 4 L/min were studied. MEASUREMENTS AND MAIN RESULTS: CO2 was measured at the breathing circuit test lung interface with a mainstream capnometer. Duration of CO2 absorption was determined as the time for the inspired CO2 tension (PICO2) to increase from 0 mm to 7 mm of mercury. The times of this interval were recorded four times for each fresh gas flow rate and compared by analysis of variance; p less than 0.05 was considered significant. Time to soda lime failure was significantly longer at 2 L/min than at 1 L/min fresh gas flow and at 1 L/min than at 0.25 L/min fresh gas flow. CONCLUSION: Because soda lime color indicators are unreliable, when a semiclosed breathing circle is used at a low rate of fresh gas flow without CO2 monitoring, the CO2 absorbent must be replaced more frequently.
M Ohrn; N Gravenstein; M L Good
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Publication Detail:
Type:  In Vitro; Journal Article    
Journal Detail:
Title:  Journal of clinical anesthesia     Volume:  3     ISSN:  0952-8180     ISO Abbreviation:  J Clin Anesth     Publication Date:    1991 Mar-Apr
Date Detail:
Created Date:  1991-07-08     Completed Date:  1991-07-08     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  8812166     Medline TA:  J Clin Anesth     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  104-7     Citation Subset:  IM    
Department of Anesthesiology, University of Florida College of Medicine, Gainesville.
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MeSH Terms
Anesthesia, Closed-Circuit*
Calcium Compounds*
Carbon Dioxide / pharmacokinetics*
Sodium Hydroxide*
Reg. No./Substance:
0/Calcium Compounds; 0/Oxides; 124-38-9/Carbon Dioxide; 1310-73-2/Sodium Hydroxide; 8006-28-8/soda lime

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

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