APPLIED RADIOLOGICAL ANATOMY

Detailed explanation-1: -Because of poor elastic recoil, such patients have high lung compliance. Their alveolar sacs have a high residual volume, which in turn causes difficulty in exhaling the excess air out of the lung, and patients develop shortness of breath.

Detailed explanation-2: -Dynamic compliance describes the compliance measured during breathing, which involves a combination of lung compliance and airway resistance. This is defined as the change in lung volume by the change in pressure, in the presence of flow.

Detailed explanation-3: -Dynamic compliance is always lower than static compliance. The reason for this is that dynamic compliance, in addition to the usual chest wall pressure and lung pressure, also incorporates airflow resistance. This is the main difference between static and dynamic compliance.