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20 Cards in this Set
- Front
- Back
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Define Oxygen content
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Oxygen content (CaO2):
Amount of oxygen sent to the tissues in every 100 mL of blood |
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(CaO2) Normal amount of oxygen delivered to the tissues in every 100 mL/blood
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20 vol%
CaO2 = (15 x 1.34 x 0.98) + (0.003 x 40) = 20 mL/100 mL blood or 20 Vol% |
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Define Oxygen Consumption a.k.a. O2 Uptake (VO2)
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Amount of oxygen used by the tissues in one minute; (difference of oxygen sent and oxygen returned)
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Give the normal amount of oxygen used by the tissues in 1 minute (VO2)
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250 ml oxygen per minute
VO2 = QT [C(a-v)O2 x 10] or VO2 = CO(CaO2 – CvO2) |
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Define Oxygen Delivery (DO2)
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Oxygen delivery (DO2) is the total amount of oxygen delivered to tissues in 1 min.
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What is the normal amount of: Total Oxygen Delivered (DO2) to the tissues in 1 minute
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1,000 mL/min or 1L/min
DO2 = QT x (CaO2 x 10) |
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Of the total amount of oxygen delivered to the tissues in 1 minute, how much is utilized by the cells?
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Only 25% of the total amt. delivered is utilized; the other 75% returns to the lungs to be re-oxygenated
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How does an increased altitude (decreased barometric P) affect the pressure of inspired oxygen?
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As the Pb decreases (higher altitude) the PiO2 is reduced
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What is the normal partial pressure of arterial oxygen (PaO2)
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80-100 mmHg
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What is the normal partial pressure of mixed venous oxygen (PvO2)
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40 mmHg
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What is the normal alveolar partial pressure of oxygen (PAO2)
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100-673 mmHg
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What is the normal alveolar-arterial oxygen tension gradient - P(A-a)O2
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FiO2 of 0.21 = <30 mmHg
FiO2 of 1.00 = <60 mmHg |
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What is the normal ratio of PaO2 to partial pressure of alveolar oxygen (PaO2/PAO2)
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0.8 - 1.0
or 80 - 100% |
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What is the normal ratio of PaO2 to fractional inspired oxygen (PaO2 range 80-100; FiO2 of 0.21)
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380-475
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Normal saturation of arterial oxygen (SaO2)
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97%
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Normal saturation of mixed venous oxygen (SvO2)
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75%
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Normal oxygen content of arterial blood (CaO2)
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20 vol%
20 mL/100 mL 20 mL/dL |
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Normal oxygen content of mixed venous blood (CvO2)
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15 vol%
15 mL/100 mL 15 mL/dL |
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Normal arterial to mixed venous oxygen content difference - C(a-v)O2
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3.5 - 5 mL/dL
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Normal oxygen delivery (DO2)
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1000 mL/min
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