Increased Reid index is classically associated with?
Chronic Bronchitis
Emphysema
Bronchiectasis
Interstitial lung disease
The diagnostic feature of chronic bronchitis in the trachea and larger bronchi is enlargement of the mucus secretinggland . The magnitude of the increase insize is assessed by the ratio of the thickness of the submucosal gland layer to that of the bronchial wall (the Reid index--normally 0.4). Chronic smoking causes submucosal gland hyperophy and hyperplasia, leading to a Reid Index of >0.5 indicating chronic bronchitis.
COPD and Asthma