pulm

Question 1

FRC calc

Answer 1

ERV + residual volume. about.40cc/kg

Question 2

vital capacity calc

Answer 2

ERV _ TV + IRV. about 70cc/kg

Question 3

conditions that decrease FRC

Answer 3

PANGOS: preggo, ascites, neonate, GA, obesity, supine position

Question 4

la place law

Answer 4

Pressure= 2 x surface tension / radius. alveoli

Question 5

poiseuille law

Answer 5

flow = pressure x radius to 4 / length x viscosity

Question 6

ratio of dead space to tital volume equation

Answer 6

(PaCO2-PEtCO2)/PaCO2=Vd/Vt. normal is under 0.3

Question 7

where we see increased dead space ventilation

Answer 7

GA: hyperventilation(rate or volume), muscle relaxants. also decreased perfusion state(down CO, PE, adding PEEP

Question 8

ventilation w/o perfusion is what

Answer 8

dead space: anatomic, alveolar(PE), physiologic(anatomic + alveolar) is 0.3L

Question 9

five causes of hypoxemia

Answer 9

hypoventilation, low FiO2, diffusion limitation, shunt, v/q mismatch

Question 10

normal A-a gradient hypoxemia

Answer 10

hypoventilation and low FiO2

Question 11

PAO2=

Answer 11

FiO2(Pbar-PH2O)-(PaCO2)/0.8

Question 12

causes of shunt physiologic

Answer 12

atelectasis, mucous plug, thebesian veins

Question 13

shunt equations

Answer 13

(CcO2-CaO2)/(CcO2-CVO2)

Question 14

PaO2 of 90% saturation

Answer 14

60

Question 15

p50 adult

Answer 15

27. 30 if pregnant b/c 2,3dpg

Question 16

p50 infant

Answer 16

19