Capnography

Question 1

Time Capnogram versus volume capnogram ?

Answer 1

PETCO2 vs time

PETCO2 vs expired volume

Question 2

Expiration divided into what 3 phases?

Answer 2

Phase I - dead space gas

Phase II - dead space gas mixing with alveolar gases (rise)

Phase III - CO2 evolving from alveoli (Plateau)

Question 3

Phase III dependent on? Which is itself dependent on?

Answer 3

CO2 content in alveoli

V/Q ratio

Question 4

PCO2 in patients with high versus low V/Q ratio?

Answer 4

Low (low cardiac output) versus high (high cardiac output)

Question 5

In ventilated patients PETCO2 is a function of?

Answer 5

Cardiac output

Question 6

In effective CPR, PETCO2 should be?

Answer 6

10-20

Question 7

Patient in cardiac arrest - abrupt rise in PETCO2 may indicate?

Answer 7

Return of spontaneous circulation

Question 8

Capnography used for?

Not useful for?

Answer 8

monitoring ventilation

#confirming ET tube placement
#monitoring effectiveness of CPR

Question 9

PETCO2 (vs PCO2)? Normally?

Answer 9

Maximum partial pressure of CO2 at end expiration versus partial pressure of CO2 in alveoli

30-40