Blood Gases Flashcards
1
Q
Minute ventilation equation
A
MV = tidal volume x RR
2
Q
Alveolar ventilation equation
A
(tidal volume - dead space) x RR
3
Q
How much air is typically dead space?
A
30%
4
Q
What is CO2 clearance determined by?
A
minute ventilation
5
Q
Diseases that increase dead space (4)
A
- COPD
- PE
- Asthma
- ARDS
6
Q
Physiologic right-to-left shunts (3)
A
- ARDS
- PNA
- Atelectasis
7
Q
Anatomic right-to-left shunts (3)
A
VSD or ASD w/ pulm HTN
8
Q
Do anatomic right-to-left shunts improve with supplemental O2?
A
No
9
Q
Diseases w/ low V/Q ratio and low PaO2
A
COPD
Asthma
Hepato-pulmonary syndrome
Pulmonary edema
10
Q
Disease w/ high V/Q ratio, low PaCO2, high PaO2
A
PE
