Which statement about emphysema types is true?

Which statement about emphysema types is true?

• A. Bronchiectasis Is a Type of Emphysema
• B. Panacinar Emphysema Is Linked to Alpha-1 Antitrypsin Deficiency
• C. Centriacinar Affects Entire Acinus
• D. None of the Above

Answer: (B)

The question tests how emphysema subtypes correlate with their underlying causes and patterns of destruction. Panacinar (pan-acinular) emphysema involves destruction of the entire acinus—from the respiratory bronchioles through the alveoli—and is classically linked to alpha-1 antitrypsin deficiency. Alpha-1 antitrypsin normally inhibits elastase, protecting elastic tissue in the lungs. When this inhibitor is deficient, elastase activity goes unchecked, leading to widespread destruction of elastic fibers throughout the acinus. That’s why the panacinar pattern is associated with the deficiency. Bronchiectasis is not a type of emphysema; it’s a different condition characterized by chronic dilation of the airways due to infection and inflammation, so that statement isn’t correct. Centriacinar (centrilobular) emphysema predominantly affects the central parts of the acinus around the respiratory bronchioles and is more closely linked to smoking; it does not involve the entire acinus, so describing it as affecting the whole acinus isn’t accurate. Since there is a true statement here, “none of the above” would be false.

The question tests how emphysema subtypes correlate with their underlying causes and patterns of destruction. Panacinar (pan-acinular) emphysema involves destruction of the entire acinus—from the respiratory bronchioles through the alveoli—and is classically linked to alpha-1 antitrypsin deficiency. Alpha-1 antitrypsin normally inhibits elastase, protecting elastic tissue in the lungs. When this inhibitor is deficient, elastase activity goes unchecked, leading to widespread destruction of elastic fibers throughout the acinus. That’s why the panacinar pattern is associated with the deficiency.

Bronchiectasis is not a type of emphysema; it’s a different condition characterized by chronic dilation of the airways due to infection and inflammation, so that statement isn’t correct. Centriacinar (centrilobular) emphysema predominantly affects the central parts of the acinus around the respiratory bronchioles and is more closely linked to smoking; it does not involve the entire acinus, so describing it as affecting the whole acinus isn’t accurate. Since there is a true statement here, “none of the above” would be false.