Volume - Chronic Obstructive Pulmonary Disease (COPD) This is the total number of chronic obstructive pulmonary disease (COPD) cases observed at a particular hospital. Chronic obstructive pulmonary disease is a disorder that persistently obstructs bronchial airflow. The most common causes of COPD are two related diseases, chronic bronchitis and emphysema. COPD obstructs air flowing in and out of the lungs. The obstruction is generally irreversible and becomes worse over time. Reference: [4]

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