PH. 7.2 PO2 mm Hg 50 mm Hg, HCO3– 13, the values goes in favour of –
Correct Answer: Both respiratory and metabolic acidosis
Description: In this patient
PH →Decreased (N → 7.4)
PCO2 → Increased (N-40 mm Hg)
HCO3- →Decreased (N-24 mmol/L)
First step
Determine whether alkalosis or acidosis is present
Decreased pH indicates acidosis
Second step
Inspect the HCO3- / CO2 to determine the cause of acidosis
Here both the abnormalities are in sync with a decrease in pH
Increase in CO2 → Produces acidosis (respiratory)
The decrease in HCO3- → Produces acidosis (metabolic)
There is no compensatory response
It can be easily concluded, that it is a case of mixed respiratory acidosis together with metabolic acidosis
The other very simple way to detect these mixed disorders is to observe the HCO3-/CO2 ratio.
HCO3-/CO2 ratio moves in the opposite direction
There is no need to proceed to the third step.
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