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Review article: Can venous blood gas analysis replace arterial in emergency medical care.
MedLine Citation:
PMID:  21143397     Owner:  NLM     Status:  In-Data-Review    
The objectives of the present review are to describe the agreement between variables on arterial and venous blood gas analysis (in particular pH, pCO(2) , bicarbonate and base excess) and to identify unanswered questions. MEDLINE search of papers published from 1966 to January 2010 for studies comparing arterial and peripheral venous blood gas values for any of pH, pCO(2) , bicarbonate and base excess in adult patients with any condition in an emergency department setting. The outcome of interest was mean difference weighted for study sample size with 95% limits of agreement. The weighted mean arterio-venous difference in pH was 0.035 pH units (n= 1252), with narrow limits of agreement. The weighted mean arterio-venous difference for pCO(2) was 5.7 mmHg (n= 760), but with 95% limits of agreement up to the order of ±20 mmHg. For bicarbonate, the weighted mean difference between arterial and venous values was -1.41 mmol/L (n= 905), with 95% limits of agreement of the order of ±5 mmol/L. Regarding base excess, the mean arterio-venous difference is 0.089 mmol/L (n= 103). There is insufficient data to determine if these relationships persist in shocked patients or those with mixed acid-base disorders. For patients who are not in shock, venous pH, bicarbonate and base excess have sufficient agreement to be clinically interchangeable for arterial values. Agreement between arterial and venous pCO(2) is too poor and unpredictable to be clinically useful as a one-off test but venous pCO(2) might be useful to screen for arterial hypercarbia or to monitor trends in pCO(2) for selected patients.
Anne-Maree Kelly
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Emergency medicine Australasia : EMA     Volume:  22     ISSN:  1742-6723     ISO Abbreviation:  Emerg Med Australas     Publication Date:  2010 Dec 
Date Detail:
Created Date:  2010-12-14     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  101199824     Medline TA:  Emerg Med Australas     Country:  Australia    
Other Details:
Languages:  eng     Pagination:  493-8     Citation Subset:  IM    
Copyright Information:
© 2010 The Author. EMA © 2010 Australasian College for Emergency Medicine and Australasian Society for Emergency Medicine.
Joseph Epstein Centre for Emergency Medicine Research at Western Health The University of Melbourne, Melbourne, Victoria, Australia.
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