Hypoxemia algorithm Flashcards

1
Q

How would you calculate the Aa gradient
What is the normal Aa gradient
-how would you adjust for age

A

PAO2 - PaO2
PAO2 = (FiO2 x (Pb- PH2O)) - (PaCO2/R)

1.33-2kPa but increases with age
(age/4) +4

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2
Q

How would you interpret a normal Aa gradient

A

(age/4) + 4

-hypoxemia due to hypoventilation or altitude

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3
Q

How would you interpret an increased Aa gradient

What would you do

A

Problem with the alveolar capillary exchange surface

FiO2 100%

  • responsive => due to low V/Q
  • decreased response => due to a shunt
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