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Posted: October 31st, 2023
Can you explain the pathophysiological changes that occur in the lungs during chronic obstructive pulmonary disease (COPD) and how they lead to symptoms such as shortness of breath and decreased lung function?
Chronic obstructive pulmonary disease (COPD) is a progressive and irreversible condition that affects the lungs and the ability to breathe. It is caused by exposure to harmful substances, such as tobacco smoke, that damage the airways and the alveoli, the tiny air sacs where gas exchange occurs. COPD can manifest as chronic bronchitis, emphysema, or both.
Chronic bronchitis is characterized by inflammation and narrowing of the bronchi, the large airways that branch from the trachea. This leads to increased mucus production, coughing, and difficulty breathing. The mucus can also trap bacteria and cause infections.
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Emphysema is a disease of the alveoli, which lose their elasticity and become overstretched. This impairs their ability to recoil and expel carbon dioxide from the lungs. As a result, some alveoli collapse and create larger air spaces that reduce the surface area for gas exchange. This leads to shortness of breath, especially during physical activity.
The pathophysiological changes in COPD affect not only the lungs, but also the cardiovascular system. The reduced oxygen levels in the blood can cause pulmonary hypertension, which is high blood pressure in the arteries that supply the lungs. This puts extra strain on the right side of the heart, which has to pump harder to overcome the resistance. Over time, this can lead to right-sided heart failure, also known as cor pulmonale.
COPD is a serious condition that can impair the quality of life and increase the risk of mortality. However, it can be prevented by avoiding exposure to harmful substances and treated by medications, oxygen therapy, pulmonary rehabilitation, and lifestyle changes.
References:
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- COPD Pathophysiology: What Happens to Your Lungs? - Verywell Health. https://www.verywellhealth.com/copd-pathophysiology-914745 (accessed Oct 5, 2023).
- What Is the Pathophysiology of COPD? - Healthline. https://www.healthline.com/health/copd/pathophysiology (accessed Oct 5, 2023).
- Understanding COPD from a cardiovascular perspective - Harvard Health. https://www.health.harvard.edu/heart-health/understanding-copd-from-a-cardiovascular-perspective (accessed Oct 5, 2023).
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