Acute respiratory failure Flashcards
1
Q
Define respiratory failure
A
loss of ability to ventilate or provide adequate o2 to the body.
Clinically Respiratory failure is defined as PaO2 <60 mmHg
while breathing air, or a PaCO2 >50 mmHg
2
Q
Respiratory failure can be of two kinds
A
hypoxemic
hypercapnic
3
Q
Differentiate acute and chronic respiratory distress
A
acute: low ph, develops in minutes to hours
chronic: normalish ph, develops over days, increase in HCO3
4
Q
Type 1 hypoxemic respiratory failure is
A
PaO2 <60 with normal or low PaCO2 (normal/high ph)
most common
causes by V’Q mismatch and shunt
5
Q
Type 2 Hypercapnic respiratory failure
A
PaCO2>50
Ph depends on level of HCO3 (and the level of HCO3 depends on the duration of hypercapnia)