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i work in sicu,since patients do not have arter line we have to needle patient many times to take ABG sample.sometimes radial artery is out of work due to needling I use dorsal pedis instead,what do you do in this circumstance?
I really do not think that it would make any difference at all. Think about the art/veno system on a very small scale. 1) You have the big arteries which get smaller and smaller 2) At the destination sites, the arteries turn into capillaries 3) At this point, deoxygenated blood goes into veno system- none is returned to arterial. At this point you are saying "well duh!", but think about it like this- no oxygen is lost until the RBCs reach the destination site (capillaries), so even at the furthest point in the body, the oxygen sat/ partial pressure will be the same. Remember that Pa02 is the amount of O2 bound to 1 gram of hemoglobin. 1 gram of hgb in the radial is the same as 1 gram of hgb in the foot.
in order of preference
They don't even mention pedal, but note that femoral sites are associated with increased infection. I wonder how femoral infection rates compare to pedal?
Ah, but according to UpToDate (http://www.uptodate.com/contents/arterial-blood-gases): Site selection — The initial step in percutaneous needle puncture is locating a palpable artery. Common sites include the radial, femoral, brachial, dorsalis pedis, or axillary artery. There is no evidence that any site is superior to the others. However, the radial artery is used most often because it is accessible, easily positioned, and more comfortable for the patient than the alternative sites.