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Flashcards in calculations and blood gas/pH Deck (7)
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1

Give the Henderson-Hasselbach for blood pH, aka the bicarbonate buffer system
:

ph= 6.1 + log HCO3- / (0.03 x PCO2)

2

how do you convert barometric pressure in inches to mmHg?

multiply by 25.4, bc that's the number of mm in an inch

3

what anticoagulant is acceptable in a blood gas sample? what vessel is drawn from?

heparin, flushing the syringe with heparin is adequate, very little needed; arterial!

4

what is fiO2?

fraction of inspired O2

5

what are 4 primary blood buffer bases in order of concentration ?

BICARBONATE, deoxyHEMOGLOBIN, albumin, and monohydrogen phosphate

6

what equation can be used to accurately calculate the blood pH, using what values from the blood gas?

the Henderson-Hasselbach; the HCO3- concentration and the dissolved CO2 which is PCO2 x 0.03

7

how would exposure of a normal arterial blood sample to air at sea level affect the PO2, PCO2 and pH and why?

due to the higher O2 pressure and lower CO2 pressure of ambient air compared to blood, oxygen would be gained by the sample and CO2 lost; LOss of CO2 would shift the bicarb buffer system's equilibrium to the right, decreasing H+ concentration thus making it more alkaline