Readers ask: Why Is Inspiration Compliance Less Than Expiration?

When the outside pressure is made more negative (i.e., lower than atmospheric), the lung inflates and its volume increases. For a given outside (intrapleural) pressure, the volume of the lung is higher during expiration than during inspiration. Thus, lung compliance is higher during expiration than during inspiration.

What causes decreased compliance?

Restrictive lung diseases – fibrosis and interstitial lung disease: In interstitial lung diseases, the lung and/or chest wall compliance has become decreased. Therefore there is an increased tendency for the lungs to collapse.

Why does lung compliance decrease with increasing lung volume?

In the case of atelectasis, pulmonary compliance decreases due to a decrease in the volume of the lung and requires higher pressure to inflate the alveoli. Obtaining a compliance curve along with oximetry and arterial gas analysis is one useful method in ICU monitoring.

Why is dynamic compliance less than static compliance?

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. The consequence of this is a higher pressure measured for unit volume, i.e. a lower lung compliance.

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What factors influence lung compliance?

Two factors determine lung compliance: elasticity of the lung tissue and surface tensions at air water interfaces. Two factors determine lung compliance – elasticity of the lung tissue and surface tensions at air water interfaces.

Why is compliance more in expiration?

The volume of the lung is measured at different pressures. For a given outside (intrapleural) pressure, the volume of the lung is higher during expiration than during inspiration. Thus, lung compliance is higher during expiration than during inspiration.

Why are smaller alveoli more compliant?

This is because smaller alveolar volumes would naturally reduce the surface area of the thin fluid lining. The combined force of surface tension throughout the lung’s alveoli serve as a powerful contributor to the elastic recoil of the lung.

What causes a decrease in lung compliance?

Common causes of decreased lung compliance are pulmonary fibrosis, pneumonia and pulmonary edema. In an obstructive lung disease, airway obstruction causes an increase in resistance. During normal breathing, the pressure volume relationship is no different from in a normal lung.

Why are the lungs normally stretched even during expiration?

The forces that are responsible for normal resting expiration come from the elastic recoil of the lung and abdominal organs and from surface tension. The lungs contain a substantial amount of elastic tissue, which stretches as the lung expands during inspiration.

Why does lung compliance increase with age?

In the lungs of people of age, the increases because of an in diameter. This is accompanied by in airway resistance and does not change. After the age of the diameter of the decreases, but again there is in airway resistance.

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What is the difference between static compliance and dynamic compliance?

Dynamic compliance describes the compliance measured during breathing, which involves a combination of lung compliance and airway resistance. Static compliance describes pulmonary compliance when there is no airflow, like an inspiratory pause.

Why does emphysema increase compliance?

In a highly compliant lung, as in emphysema, the elastic tissue is damaged by enzymes. These enzymes are secreted by leukocytes (white blood cells) in response to a variety of inhaled irritants, such as cigarette smoke. Patients with emphysema have a very high lung compliance due to the poor elastic recoil.

Why are bronchioles narrowed in emphysema?

When you breathe out, the alveoli easily deflate, expelling the carbon dioxide out of the body through the airways. But for people with emphysema, the alveolar walls are damaged and the air sacs lose their normal elasticity, causing the airways to the lungs (bronchioles) to collapse.

What is decreased lung compliance?

A low lung compliance means that the lungs are “stiff” and have a higher than normal level of elastic recoil. A stiff lung would need a greater-than-average change in pleural pressure to change the volume of the lungs, and breathing becomes more difficult as a result.

When lung compliance is reduced by half How will time constants be affected?

It is defined as the “time required to inflate a lung region to 60% of its filling capacity”. 80. When lung compliance is reduced, how will time constants be affected? The time constants will be reduced by half.

Does asthma affect lung compliance?

The conditions both in bronchial asthma and in pulmonary emphysema have been studied (for review see Ehrner (2)), and in these series a considerable proportion of the patients have shown compliance values within the normal range.

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