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6 Cards in this Set
- Front
- Back
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Five causes of hypoxemia |
1. Low inspired PiO2 2. Hypo ventilation These: the A-a gradient will be normal bc the lungs are normal
3. Diffusion limitations 4. Shunt 5. V/Q imbalance There are abnormalities in the A-a gradient so it is will be increased |
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V/Q of... Dead space Normal lung V/Q imbalance Shunt |
V/Q of... Dead space infinity Normal lung 1 V/Q imbalance <1 Shunt 0 |
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A-a gradient |
Normal room air at sea level PA02=100mmHg
Normal room air at sea level PaO2=95
Because of physiologic shunts, normally is a grading if 0-10mmHg |
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Oxygen carry content formula |
CaO2 (content)=(Hb x SaO2 x 1.34) + (PaO2 x 0.003); if equal to a 100% than SaO2 is O3 carrying capacity |
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Oxygen Deelivery |
DO2=CaO2 x CO x 10 |
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O2 Hb dissociation curve: 4 influences |
Right shift= less uptake at the alveolar level but greater degree of unloading at tissue level (example is exercising)
Right shift if Decrease in pH Increased PaCO2 (Bohr effect) Increase in 2,3 DPG Increase in temperature |
