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EXAMPLES. Example. 56 year old woman in respiratory distress with: pH 7.31 ( ↓, acidosis, non-compensated) PC02 74 ( ↑, increased, acidosis) P02 58 ( ↓, decreased, hypoxemia) HCO3 25 ( normal range)

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Example
Example

  • 56 year old woman in respiratory distress with:

    • pH 7.31 ( ↓, acidosis, non-compensated)

    • PC02 74 ( ↑, increased, acidosis)

    • P02 58 ( ↓, decreased, hypoxemia)

    • HCO3 25 ( normal range)

    • Answer: Non-compensated Respiratory Acidosis with (moderate) hypoxemia. Aka – Acute ventilatory failure with hypoxemia


Example1
Example

  • 56 year old woman in previous respiratory distress has an ABG of:

    • pH 7.31 ( ↓, acidosis, non-compensated)

    • PC02 54 ( ↑, increased, acidosis)

    • P02 62 ( ↓, decreased, hypoxemia)

    • HCO3 26 ( normal range)

    • Answer: Partially compensated Respiratory Acidosis with (mild) hypoxemia. Aka – Acute ventilatory failure with hypoxemia


Acute alveolar hyperventilation with hypoxemia
Acute Alveolar Hyperventilation with HYPOXEMIA

  • pH: increased 7.53

  • PaCO2: decreased 28 mm Hg

  • HCO3-: decreased 20 mEq/L

  • PaO2: decreased 63 mm Hg

ABG Changes Example


Chronic Ventilatory Failure

pH: 7.38

PaCO2: 66 mm Hg

HCO3-: 35 mEq/L

PaO2: 63 mm Hg

Acute alveolar hyperventilation superimposed on chronic ventilatory failure

pH: 7.55

PaCO2: 62 mm Hg

HCO3-: 38 mEq/L

PaO2: 51 mm Hg


Acute alveolar hyperventilation superimposed on chronic ventilatory failure
Acute Alveolar Hyperventilation Superimposed on CHRONIC VENTILATORY FAILURE

pH: increased 7.55

PaCO2: increased 62 mm Hg

HCO3-: increased 38 mEq/L

PaO2: decreased 51 mm Hg

ABG Changes Example


Metabolic acidosis
Metabolic Acidosis

pH: decreased 7.26

PaCO2: normal 37 mm Hg

HCO3-: decreased 18 mEq/L

PaO2: normal 94 mm Hg

(or ↓ when lactic (or 52 mm Hg when acidosis is present) lactic acidosis is present)

ABG Changes Example


Metabolic alkalosis
Metabolic Alkalosis

pH: increased 7.56

PaCO2: normal 44 mm Hg

HCO3-: decreased 27 mEq/L

PaO2: normal 94 mm Hg

ABG Changes Example


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