chapter 4

Question 1

exhaled gases

Answer 1

nitrogen -78.8%
o2- 17%
co2-4%

Question 2

Pao2 is determined by?

Answer 2

PO2

Question 3

PaO2 is also determined by how high _________?

Answer 3

PAo2

Question 4

rq varies with ________?

Answer 4

disease

Question 5

diffusion occurs because of ________and moves co2 of _____ and o2 ______?

Answer 5

pressure gradient, 6 mm hg, 60 mm hg

Question 6

v/q mistmatch occur because________?

Answer 6

ventilation exceeds perfusion

perfusion exceed ventilation

Question 7

high v/q we have_________?

Answer 7

increased physiologic deadspace, wasted ventilation and po2 is high and high pco2

Question 8

pulmonary circulation

Answer 8

3-5% and bronchial arteries, and thebesien viens.

Question 9

as v/q ratio lowers?

Answer 9

hypoxia worsens, pco2 is not effected unless there is hypoventilation

Question 10

in the absence of v/q mismatching, PA-aO2 would be ________?

Answer 10

zero

Question 11

young healthy individual has pA-aO2 diffence would be___________and in adult is _________?

Answer 11

5-15 mmg, and is higher

or greater than 100 mm hg with fio2 of 100%

Question 12

pa02/fio2 normal?

Answer 12

normal is greater than 300
less 300 indicates a severe deficit in gas exchange
less than 200 indicates acute respiratory distress syndrome

Question 13

pulmonary right to left shunt

Answer 13

increased-decreased

Question 14

ventilation perfusion imbalance

Answer 14

increased-decreased

Question 15

diffusion barrier

Answer 15

increased-decreased

Question 16

hypoventilation

Answer 16

normal- decreased

Question 17

cardiac-right to left shunt

Answer 17

increased-decreased

Question 18

decreased pio2

Answer 18

normal-normal

Question 19

low mixed venous o2 content

Answer 19

increased - decreased