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Pathology

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The Lungs

Question
22 out of 54
 

Which of the following is involved in hypoxia in a smoker with noticeable increase in anteroposterior chest width if oxygen therapy is effective? (AIIMS May 2013)



A Anaemia caused by blood loss

B Edematous tissues

C Emphysema

D Right-to-left cardiac shunts

Ans. C Emphysema

a. Chronic pulmonary emphysema is characterized by distention of small air spaces distal to the respiratory bronchioles and destruction of alveolar septa. Long-term cigarette smoking is the usual cause.

b. The marked loss of lung parenchyma associated with emphysema leads to a decrease in the diffusion capacity of the lungs that reduces their ability to oxygenate blood and remove carbon dioxide, contributing to the "barrel chest" appearance of these patients.

The Lungs Flashcard List

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