Blood gas analysis: Difference between revisions
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==Venous blood== | ==Venous blood== | ||
One study concluded "The mean difference between arterial and venous values of pH was 0.03 pH units."<ref name="pmid16858095">{{cite journal |author=Middleton P, Kelly AM, Brown J, Robertson M |title=Agreement between arterial and central venous values for pH, bicarbonate, base excess, and lactate |journal=Emerg Med J |volume=23 |issue=8 |pages=622–4 |year=2006 |month=August |pmid=16858095 |doi=10.1136/emj.2006.035915 |url=http://emj.bmj.com/cgi/pmidlookup?view=long&pmid=16858095 |issn=}}</ref> If the pCO2 of of venous blood is less than 45 mm Hg, then the arterial pCO2 is very likely less than 50 mm hg.<ref name="pmid15837016">{{cite journal |author=Kelly AM, Kerr D, Middleton P |title=Validation of venous pCO2 to screen for arterial hypercarbia in patients with chronic obstructive airways disease |journal=J Emerg Med |volume=28 |issue=4 |pages=377–9 |year=2005 |month=May |pmid=15837016 |doi=10.1016/j.jemermed.2004.10.017 |url=http://linkinghub.elsevier.com/retrieve/pii/S0736-4679(05)00022-3 |issn=}}</ref> | One study concluded "The mean difference between arterial and venous values of pH was 0.03 pH units."<ref name="pmid16858095">{{cite journal |author=Middleton P, Kelly AM, Brown J, Robertson M |title=Agreement between arterial and central venous values for pH, bicarbonate, base excess, and lactate |journal=Emerg Med J |volume=23 |issue=8 |pages=622–4 |year=2006 |month=August |pmid=16858095 |doi=10.1136/emj.2006.035915 |url=http://emj.bmj.com/cgi/pmidlookup?view=long&pmid=16858095 |issn=}}</ref> If the pCO2 of of venous blood is less than 45 mm Hg, then the arterial pCO2 is very likely less than 50 mm hg.<ref name="pmid15837016">{{cite journal |author=Kelly AM, Kerr D, Middleton P |title=Validation of venous pCO2 to screen for arterial hypercarbia in patients with chronic obstructive airways disease |journal=J Emerg Med |volume=28 |issue=4 |pages=377–9 |year=2005 |month=May |pmid=15837016 |doi=10.1016/j.jemermed.2004.10.017 |url=http://linkinghub.elsevier.com/retrieve/pii/S0736-4679(05)00022-3 |issn=}}</ref> Regarding pO2, venous pO2 is much lower.<ref name="pmid14736638">{{cite journal |author=Yildizdaş D, Yapicioğlu H, Yilmaz HL, Sertdemir Y |title=Correlation of simultaneously obtained capillary, venous, and arterial blood gases of patients in a paediatric intensive care unit |journal=Arch. Dis. Child. |volume=89 |issue=2 |pages=176–80 |year=2004 |month=February |pmid=14736638 |pmc=1719810 |doi= |url=http://adc.bmj.com/cgi/pmidlookup?view=long&pmid=14736638 |issn=}}</ref> | ||
==Artifacts in measurement== | ==Artifacts in measurement== | ||
Revision as of 07:15, 28 January 2009
In medicine and physiology, blood gas analysis is "measurement of oxygen and carbon dioxide in the blood."[1]
Venous blood
One study concluded "The mean difference between arterial and venous values of pH was 0.03 pH units."[2] If the pCO2 of of venous blood is less than 45 mm Hg, then the arterial pCO2 is very likely less than 50 mm hg.[3] Regarding pO2, venous pO2 is much lower.[4]
Artifacts in measurement
Delay in analysis after collection of blood
Exposure of bllod to room aire
References
- ↑ Anonymous (2024), Blood gas analysis (English). Medical Subject Headings. U.S. National Library of Medicine.
- ↑ Middleton P, Kelly AM, Brown J, Robertson M (August 2006). "Agreement between arterial and central venous values for pH, bicarbonate, base excess, and lactate". Emerg Med J 23 (8): 622–4. DOI:10.1136/emj.2006.035915. PMID 16858095. Research Blogging.
- ↑ Kelly AM, Kerr D, Middleton P (May 2005). "Validation of venous pCO2 to screen for arterial hypercarbia in patients with chronic obstructive airways disease". J Emerg Med 28 (4): 377–9. DOI:10.1016/j.jemermed.2004.10.017. PMID 15837016. Research Blogging.
- ↑ Yildizdaş D, Yapicioğlu H, Yilmaz HL, Sertdemir Y (February 2004). "Correlation of simultaneously obtained capillary, venous, and arterial blood gases of patients in a paediatric intensive care unit". Arch. Dis. Child. 89 (2): 176–80. PMID 14736638. PMC 1719810. [e]