ABG algorithm Flashcards

1
Q

Step 1 of acidosis
pH is low => acidosis
What is the PCO2

A

Normal or low

  • metabolic acidosis
  • if low => partial compensation

High

  • respiratory acidosis
  • move onto step 2
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2
Q

Step 2 of acidosis

Is the sum of PCO2 and PO2 greater than 18kPa

A

No
-lung problem with inadequate alveolar ventilation

Yes

  • respiratory depression
  • too much O2 for CO2 retainer
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3
Q

Step 1 of alkalosis
pH is high => alkalosis
What is the PCO2

A

Normal or high

  • metabolic alkalosis
  • if high => partial compensation

Low
-respiratory alkalosis
move onto step 2

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4
Q

Step 2 of alkalosis

Is the PO2 low

A

No
-other driver for ventilation (anxiety, pain)

Yes
-gas exchange problem driving increased ventilation (asthma, fibrosis, altitude)

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5
Q

What if the pH is normal but the PO2, PCO2 and HCO3 values are not

A

Full compensation is occuring

If CO2 retention is chronic, HCO3 will also be high

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