1
Q
normal pH
A
7.35-7.45
2
Q
PaCO2
A
35-45 mmHg
3
Q
PaO2
A
80-100 mmHg
4
Q
HCO3
A
22-26 mEq/L
5
Q
RSBI
A
rapid shallow breathing index
<105
calculated: RR/Vt in L
6
Q
MIP
A
max insp. pressure
-20 to -30 cmH2O
7
Q
MEP
A
Max exp. pressure
>40 cmH2O
8
Q
Vt
A
> 5 mL/kg
9
Q
VC
A
10 mL/kg
about 3-5 L
10
Q
normal VD/Vt ratio
A
20-40% off vent
less than 60% on vent
calculate:
PaCO -PECO2/PaCO
11
Q
A-aDO2
A
alveolar-arterial diffusion of oxygen
25-65 mmHg
Elevated indicates a v/q mismatch
12
Q
CaO2
A
17-20%
13
Q
CvO2
A
14-16%
14
Q
C(a-v)O2
A
Mixed venous
4-5%
If it’s high, it can indicate shunting
15
Q
P/F ratio
A
PaO2/FIO2
>400
(determines the severity of lung injury)
Respiratory Therapy
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