Pulmonary Physiology VT ERV IRV VC RV TLC FRC FEV1/FVC 1- Restrictive lung disea

Question

Pulmonary Physiology

VT

ERV

IRV

VC

RV

TLC

FRC

FEV1/FVC

1- Restrictive lung diseases are characterized by a decrease in compliance of the lungs or a problem with the pleura or musculature, making it harder to expand the lungs. Changes in which of the above lung measurements would be indicative of a restrictive disease and why?

2- Obstructive diseases are characterized by an increase in airway resistance. This often makes it harder to get the air out of the lungs. Changes in which of the above lung measurements would be indicative of an obstructive disease and why?

Explanation / Answer

Obstructive disorder:

characterized by limitation of expiratory airflow example asthma ,COPD

Decreased FEV1, FEV1/FVC

Restrictive disorder

Characteristics by diminished lung volume due to:-

1. Alteration in lung parenchyma

2. Disease of pleura, chest wall eg scoliosis

Decreased TLC ,FVC

Normal or increased FEV1/FVC ratio

by diminished lung volume

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