ACID-BASE ANALYSIS OF BLOOD GAS VALUES - page 9
 

Notice how placing the values on the map
pretty much tells you the interpretation

pH = 7.53

CO2 = 49

HCO3 = 41

blood gas map

The pH of 7.53 and the HCO3 of 41 are both in the alkalosis area; so this is a metabolic alkalosis. The CO2 of 49, on the opposite side of normal from the pH, tells us that breathing has decreased ( and CO2 increased ) to try to compensate for the alkalosis :
A PARTIALLY COMPENSATED METABOLIC ALKALOSIS


PARTIAL COMPENSATION

Notice that in tne last two examples the CO2 and the HCO3 are on opposite sides of normal. The value that is on the same side as the pH is the cause of the pH abnormality. The value on the opposite side of normal from the pH is attempting to compensate for the abnormality. In this case the compensation is not enough to bring the pH all the way back to the normal range of 7.35 to 7.45. This is called a "partial compensation".


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last update: december 1, 1999
© 1996-99 Charles Peshkin / EKG Skillbuilders™