need help with ABG intrepretation

  1. 0
    i'm having problem with interepretating my patient's abg result can someone help me with it?

    1) normal ph, normal hco3, low co2 (30) --- is that respiratory alkalosis?

    2) high ph (7.50), high co2 (50) high hco3 (30) --- is that metabolic alkalosis?
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  3. 4 Comments so far...

  4. 0
    1) Need ALL the ABG numbers but it looks like fully compensated metabolic acidosis.

    2) Need ALL the ABG numbers but it looks like a COPD pt.
  5. 1
    respiratory acidosis= decreased ph increased hco3 increased pco2

    respiratory alkalosis= increased ph decreased hco3 deacreased pco2

    metabolic acidosis= decreased ph decreased hco3 decreased pco2 =hyperventilation

    metabolic alkalosis= increased ph increased hco3 increased pco2=hypoventilation

    the bold indicates the primary abnormality.
    canyonforest likes this.
  6. 0
    1) normal ph, normal hco3, low co2 (30)

    normal abg, acute hyperventilation
    or
    acute asthmatic getting ready to crash.

    the p02 would indicate the difference.

    with just these numbers the abg really isnít acidotic or alkalotic anything. the ph is normal, the pco2 is off but itís not trying to compensate for anything. if it was fully compensated the hc03 would be off too. itís just hyperventilation that hasnít affected the ph yet. or an asthmatic getting ready to fall on the floor. :uhoh21:


    2) high ph (7.50), high co2 (50) high hco3 (30) --- is that metabolic alkalosis?

    yes, metabolic alkalosis. whichever compensatory mechanism is the same as the phÖ thatís the acidotic/alkalotic choice.

    ph : alk
    pc02 : acid
    hc03 : alk




    just for information purposes, these are abgs for the 3 stages of an asthma attack:
    • phase 1 (mild): respiratory alkalosis: high ph, low pco2, normal or high po2
    • phase 2 (mod): normal ph, near normal pco2, decreased po2
    • phase 3 (severe): respiratory acidosis: low ph, high pco2, low po2 - prepare for intubation, especially if signs of decreased mental status
  7. 0
    Quote from rrtm2
    1) normal ph, normal hco3, low co2 (30)

    normal abg, acute hyperventilation
    or
    acute asthmatic getting ready to crash.

    the p02 would indicate the difference.

    with just these numbers the abg really isnít acidotic or alkalotic anything. the ph is normal, the pco2 is off but itís not trying to compensate for anything. if it was fully compensated the hc03 would be off too. itís just hyperventilation that hasnít affected the ph yet. or an asthmatic getting ready to fall on the floor. :uhoh21:


    2) high ph (7.50), high co2 (50) high hco3 (30) --- is that metabolic alkalosis?

    yes, metabolic alkalosis. whichever compensatory mechanism is the same as the phÖ thatís the acidotic/alkalotic choice.

    ph : alk
    pc02 : acid
    hc03 : alk




    just for information purposes, these are abgs for the 3 stages of an asthma attack:
    • phase 1 (mild): respiratory alkalosis: high ph, low pco2, normal or high po2
    • phase 2 (mod): normal ph, near normal pco2, decreased po2
    • phase 3 (severe): respiratory acidosis: low ph, high pco2, low po2 - prepare for intubation, especially if signs of decreased mental status
    i disagree with your 1st observastion. any asthmatic who can keep his co2 low at 30 is not crashing.


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