calculations and blood gas/pH

Question 1

<p>Give the Henderson-Hasselbach for blood pH, aka the bicarbonate buffer system
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Answer 1

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

Question 2

<p>how do you convert barometric pressure in inches to mmHg?</p>

Answer 2

<p>multiply by 25.4, bc that's the number of mm in an inch</p>

Question 3

<p>what anticoagulant is acceptable in a blood gas sample? what vessel is drawn from?</p>

Answer 3

<p>heparin, flushing the syringe with heparin is adequate, very little needed; arterial!</p>

Question 4

<p>what is fiO2?</p>

Answer 4

<p>fraction of inspired O2</p>

Question 5

<p>what are 4 primary blood buffer bases in order of concentration ?</p>

Answer 5

<p>BICARBONATE, deoxyHEMOGLOBIN, albumin, and monohydrogen phosphate</p>

Question 6

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

Answer 6

<p>the Henderson-Hasselbach; the HCO3- concentration and the dissolved CO2 which is PCO2 x 0.03</p>

Question 7

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

Answer 7

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