Lungs

Question 1

What is the normal internal/external cross-sectional area ratio and how is it calculated?

Answer 1

(Internal - external)/external Should no exceed 0.5

Question 2

What is the normal bronchoarterial diameter ratio?

Answer 2

0.8 - 2.0 >than 2x the diameter of pulmonary arteries indicates bronchiectasis or PTE

Question 3

What percentage should the cross section area of the artery be when compared to the cross sectional area of the adjecent bronchus be at the level of T8?

Answer 3

0.4-0.6

Question 4

Do Dogs and cats have distinctive septa between the lung lobules?

Answer 4

No.. this is how they differ from humans and thus their interstitium is not very prominent.

Question 5

What is the mean HU on inspiratory lungs of healthy dogs?

Answer 5

-713 HU

Question 6

What is the mean HU on expiration of the lungs in dogs?

Answer 6

-846

Question 7

Heterotopic pulmonary bone formation is common in what breed?

Answer 7

Collies and large breed dogs.

Question 8

Why should you put a dog on 30-40% O2 that is going for a lung CT?

Answer 8

To make the lungs work harder and to recruit more alveoli. Thus less atelectasis.

Question 9

Bronchial collapse happens on what cycle of respiration?

Answer 9

Expiration

Question 10

Causese of bronchial tear?

Answer 10

1. Lung lobe torsion
2. Barotrauma
3. Parasitic infestation.