matching vent and perfusion Flashcards
1
Q
hypoxia
A
low PO2
2
Q
hypoxemia
A
low PaO2 (<85)
3
Q
PaO2=
A
PaCO2/.8
4
Q
PA02=
A
PIO2-OaCI2/.8
5
Q
causes of hypoxemia
A
alv. hypoventialtion, reduced PI02, reduced FIO2, shunt, diffusion abnormality (interstitial,, EXERCISE), V/Q mismatch (main)
6
Q
hypercapnia
A
PaCO2>45, affects CNS
7
Q
causes of hypercapnia
A
alveolar hypoventilation (can’t/won’t breath), increased dead space (shallow breath), increased CO production with fixed ventilation, severe V/Q mismatch
8
Q
diagnose a shint
A
100$ FIO2… little to no change in hemoglobin sat/paO2
9
Q
V/q ideal
A
1, normal .84 ( V=4.2, Q=5)
10
Q
regional ventilation
A
higher V at base of lung, also more perfusion
11
Q
high V/q
A
less blood flow (emph, PE, hem..) compensate by rerouting blood
12
Q
low v/q
A
high Q, low V by blocked alveoli, low PAo2, high PACo2 reroute blood CHECK MEEEE
