CVR 22 Ventilation

Question 1

Equation for pulmonary ventilation

Answer 1

tidal volume x respiratory rate

usually 12/min

6000ml/min

Question 2

What is perfusion Q?

Answer 2

The blood that reaches teh alveoli

Question 3

Whats teh partial pressure of atmosphare

Answer 3

760 x .21

160 mmHg

alveolar = 100 mm

Question 4

Ficks Law of Diffusion

Answer 4

Ficks Law of Diffusion :
The greater the surface area
and the shorter the distance ;
the greater the rate of diffusion

Question 5

What is emphysema

Answer 5

loss of alveloar walls

Question 6

Ventilation (V) / Perfusion (Q) Ratio

Answer 6

The ratio of the amount of air reaching the alveoli (V)

To the amount of blood reaching the alveoli (Q)

Question 7

Arterial Hypoxemia

Answer 7

Arterial PO2 less than 80 mm

Shunting

Question 8

Hypoxia

Answer 8

Insufficient O2 to carry out normal metabolic functions – usually when arterial PO2 is less than 60 mm Hg with low V/Q

Question 9

Hypercapnia

Answer 9

Increase in arterial PCO2 above the normal range (40 mm Hg)

Hypoventilation (low V/Q))

Question 10

Hypocapnia

Answer 10

Abnormally low arterial PCO2 (usually less than 35 mm Hg)

Hyperventilation (high V/Q)

Question 11

What is shunting

Answer 11

when the alveoli of the lungs are perfused with blood as normal, but ventilation (the supply of air) fails to supply the perfused region. In other words, the ventilation/perfusion ratio (the ratio of air reaching the alveoli to blood perfusing them) is zero.