Pulmonology Book

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Oxygen SaturationAka: O2 Sat

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  1. See Also
    1. Arterial Blood Gas
  2. Factors reducing O2 Sat reliability and accuracy
    1. Reduced blood flow
      1. Vasoconstriction
      2. Hypotension
      3. Blood Pressure cuff on arm with sensor
      4. Hypothermia
    2. Severe Anemia
    3. CarboxyHemoglobin or MetHemoglobin
    4. Intense Ambient lighting
  3. Oxygen Saturation to PaO2 Relationship
    1. Non-Shifted Oxygen Saturation
      1. 100%: 90 mmHg PaO2
      2. 90%: 60 mmHg PaO2
      3. 60%: 30 mmHg PaO2
      4. 50%: 27 mmHg PaO2
    2. Mnemonic:
      1. 30-60%
      2. 60-90%
      3. 40-75%
  4. Shifted Oxygen Saturation Curve
    1. Left Shift (Same O2 Sat implies lower PaO2)
      1. Increased pH
      2. Decreased Temperature
      3. Decreased PaCO2
      4. Decreased 2,3-dpg
    2. Right Shift (Same O2 Sat implies higher PaO2)
      1. Increased Temperature
      2. Increased PaCO2
      3. Increased 2,3-dpg
      4. Decreased pH

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