ABG 2
Updated: 1/10/2021
ABG 2

Storyboard Text

  • if HCO3 increase, PH increases.if HCO3 decrease, PH decreases.(it goes in the same direction)
  • HCO3 < 22 meq/L (metabolic acidemia)HCO3 > 28 meq/L ( metabolic alkalemia)
  • Step 4HCO3 Metabolic element.
  • evaluate the problem, pure metabolic, pure respiratory or mixed.
  • Step 5Compansation(it goes always in the same direction as primary problem)
  • if pco2 increase .. Hco3 increase.if pco2 decrease .. Hco3 decrease.if Hco3 increase .. pco2 increase.if Hco3 decrease .. pco2 decrease.
  • Pco2 above expected range in mixed respiratory and metabloic acidosis
  • winter's formulaexpected paco2=1.5xHCO3+8 +/- 2
  • Pco2 below expected range, respiratory alkalosis (compansation)
  • step 6Anion Gap
  • Normal = 10-18 mmol/L
  • high anion gap metabolic acidosis> 18 mmol/L
  • Na + K
  • _
  • non anion gap metabolic acidosis(Normal)
  • CL + HCO3
  • A-a Gradient > 20 V/Q mismatch (pulmonary embolism)
  • A-a gradient= PAo2 (calculated in alveoli) - Pao2 (in ABG)PAo2(KPA)= (Fio2x93.8) - (Paco2x1.2)PAo2(mmhg)= (Fio2x713) - (Paco2x1.2)
  • Never to treat blood gases alone, you are assessing the clinical condition of the patient first and correlating it with the ABG.
  • correlate your finding with the patient
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