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Chronic obstructive pulmonary disease (COPD) is a type of progressive lung disease characterized by chronic respiratory symptoms and airflow limitation. [8] GOLD 2024 defined COPD as a heterogeneous lung condition characterized by chronic respiratory symptoms (dyspnea or shortness of breath, cough, sputum production or exacerbations) due to abnormalities of the airways (bronchitis ...
COPD is defined as a forced expiratory volume in 1 second divided by the forced vital capacity (FEV1/FVC) that is less than 0.7 (or 70%). [8] The residual volume, the volume of air left in the lungs following full expiration, is often increased in COPD, as is the total lung capacity, while the vital capacity remains relatively normal.
The scarred tissue then makes the expiration phase of respiration more difficult, leading to air not being expelled from the lungs. This is termed "air-trapping", which can be seen on medical imaging. [6] Since the scarring is non-reversible, the disease generally does not improve over time, and depending on the inciting can progress to death. [11]
Respiratory diseases, or lung diseases, [1] are pathological conditions affecting the organs and tissues that make gas exchange difficult in air-breathing animals. They include conditions of the respiratory tract including the trachea, bronchi, bronchioles, alveoli, pleurae, pleural cavity, the nerves and muscles of respiration.
COPD may require a lot more planning, pulmonologists say, but for the majority of patients without the most severe lung disease—even those on oxygen—it’s certainly doable.
During inspiration, the lungs expand to allow airflow into the lungs and thereby increasing total volume. After inspiration follows expiration during which the lungs recoil and push air back out of the pulmonary pathway. Lung compliance is the difference of volume during inspiration and expiration. [7]
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