05 Hypoxia
- saturation of hemoglobin depends on PaO2
PaO2
- in arteriole blood
- measures dissolved
- saturation of hemoglobin depends on PaO2
Hypoxia
- hypoxemia: low number calculated from equation
- hypoxia can be caused by hypoxemia and other things
HF
- hypoxia or ischemia
- pulmonary edema with CHF: may have reduced O2 content
Anemia
- O2 binding capacity reduced
- not enough Hb around
CO
- functional anemia: taking Hb away from O2
Alveolar Gas
- PAO2: O2 partial pressure in alveoli, lower because O2 exchange
- PaO2: lower because mixing of blood from vessels travel through lungs and do not go through alveoli
- high altitude: low partial pressure of O2
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