Respiratory Physiology and Crit Care

Question 1

How do you calculate Compression Factor?

Answer 1

CF= ((Vdel-Vmeasure)/RR)/ Peak airway pressure

Question 2

How do you calculate PVR?

Answer 2

PVR =80 x (PAPmean- PAOP)/CO

Question 3

When are you most likely to have an infarction post surgery if you have had one previously?

Answer 3

48-72h post op

Question 4

Why is cardioversion not effective in MAT?

Answer 4

It lacks a reentrant mechanism therefore cardioversion will not terminate.

Question 5

How much will PaCO2 change during apnea?

Answer 5

6mmHg during first minute

3-4 mmHg every minute after first.

Question 6

What is the O2 requirement for adults?

For newborns?

Answer 6

3-4 mL/kg/min adult (~250 mLO2/min for standard adult)

7-9 mL/kg/min newborn

Question 7

How much does inhalation of CO2 increase MV?

Answer 7

1-1.5L/min/mm Hg increase in PaCO2

Question 8

Does fetal hemoglobin affect dual wavelength pulse ox?

Answer 8

No, bc it’s absorption spectrum is similar to adult hemoglobin.