Formulas: Difference between revisions
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==Cardiovascular== | |||
*O2 content = (Hb x 1.34 x SaO2) + (PaO2 x 0.003) | |||
==Pulmonary== | ==Pulmonary== | ||
*Alveolar-arterial O2 gradient, pATM at sea level 760 mmHg | *Alveolar-arterial O2 gradient, pATM at sea level 760 mmHg | ||
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**Normal for young adult non-smoker < 15 mmHg at sea level at RA | **Normal for young adult non-smoker < 15 mmHg at sea level at RA | ||
**Normal estimate by age < (age/4) + 4<ref>Nickson C. Lifeinthefastlane. A-a gradient. http://lifeinthefastlane.com/ccc/a-a-gradient/.</ref> | **Normal estimate by age < (age/4) + 4<ref>Nickson C. Lifeinthefastlane. A-a gradient. http://lifeinthefastlane.com/ccc/a-a-gradient/.</ref> | ||
==Sources== | ==Sources== | ||
<references/> | <references/> | ||
Revision as of 18:11, 16 February 2016
Cardiovascular
- O2 content = (Hb x 1.34 x SaO2) + (PaO2 x 0.003)
Pulmonary
- Alveolar-arterial O2 gradient, pATM at sea level 760 mmHg
- PAO2 - paO2
- A-a O2 gradient = [FiO2 x (pATM - pH2O)] - (paCO2/0.8) - paO2
- =[FiO2 x (760 - 47)] - (paCO2/0.8) - paO2
- Normal for young adult non-smoker < 15 mmHg at sea level at RA
- Normal estimate by age < (age/4) + 4[1]
Sources
- ↑ Nickson C. Lifeinthefastlane. A-a gradient. http://lifeinthefastlane.com/ccc/a-a-gradient/.