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5 causes of hypoxemia (A-a gradient increased (2) diffusion limitation…
5 causes of hypoxemia
A-a gradient normal (less than 15mmhg)
:check:
4) hypoxic mixture or reduced fio2
fixed with supp. O2
not enough o2 in inspired gas
HIGH ALTITUDE
5) hypoventilation
fixed with supp. O2
inadequate air transfer in and out of lungs
OPIOID OVERDOSE
A-a gradient increased
2) diffusion limitation
fixed with supp O2
capillary thickening hinders O2 diffusion
PULMONARY FIBROSIS
3) V/Q mismatch
fixed with supp O2
poor matching of V/Q
COPD
1) shunt
not
fixed with supp. O2
pulmonary blood bypasses alveoli
PULMONARY EDEMA
difference between
PAO2 alveolar oxygen
paO2 arterial oxygen
determines cause of hypoxemia
wide variation between PAO2 and paO2 =significant shunt
will be A-a gradient increased
