Final answer:
Conditions associated with decreased lung compliance include restrictive diseases and obstructive diseases.
Step-by-step explanation:
Conditions associated with decreased lung compliance include restrictive diseases such as fibrosis and respiratory distress syndrome. In these diseases, the lung tissue becomes stiff and less elastic, making it more difficult to breathe. This can result in a decrease in the forced expiratory volume in one second to forced vital capacity ratio (FEV1/FVC).
Additionally, obstructive diseases such as emphysema and asthma can also decrease lung compliance. In emphysema, the destruction of alveoli reduces the surface area for gas exchange and leads to an increase in lung compliance. In asthma, inflammation and airway obstruction can cause a decrease in lung compliance.
The primary topic of this question is the conditions associated with decreased lung compliance.