The following is a recording of static pressure volume curve of lungs from different patients. The dotted line represents –

Solved296 views2015 aiims physiology
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The following is a recording of static pressure volume curve of lungs from different patients. The dotted line represents –
pulmonary_pressure

[A]. Bronchial Asthma

[B]. Emphysema

[C]. Normal

[D]. Interstitial fibrosis

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[D]. Interstitial fibrosis
Explanation :-

Compliance lung curves:

  • The change in lung volume per unit change in airway pressure is the compliance (stretchability) of the lungs and chest wall.

  • It is normally measured in the pressure range where the relaxation pressure curve is steepest, and the normal value is approximately 0.2 L/cm H2O.

  • Compliance is also slightly greater when measured during deflation than when measured during inflation.

  • The curve is shifted upward and to the left (compliance is increased) in emphysema. It should be noted that compliance is a static measure of lung and chest recoil.

  • The resistance of the lung and chest is the pressure difference required for a unit of air flow; this measurement, which is dynamic rather than static, also takes into account the resistance to air flow in the airways.

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