Hypoxia

Background

PAO2 = (PB - PH2O) x FiO2 - PaCO2/RQ

  • Normal PAO2 = 760 - 47 x 0.21 - 40/0.8
  • Normal PAO2 = 100

DDX

  1. V/Q mismatch
  2. Diffusion
  3. Hypercarbia
  4. Altitude
  5. Cardiac Shunt

See Also

Dyspnea (SOB)