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Medicine

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Respiratory

Question
3 out of 11
 

Compliance is decreased in all except? (AIPG 2011)



A Pulmonary congestion
B Emphysema

C Decreased surfactant
D Pulmonary fibrosis

Ans. B

Emphysema

Emphysema is associated with an increased static compliance.

In surfactant deficiency leads to atelectasis. That causes reduced compliance.

Extra Edge:

Compliance

Compliance is a measure of 'distensibility' and is measured as a change in lung volume per unit change in pressure.

1). Static Compliance

a. Static compliance indicates compliance when the lungs are at rest

b. Static compliance values reflect true lung compliance alone

c. Static compliance reflects elasticity of the lung and is not affected by airway resistance because there is no flow

d. Reduced static compliance indicates rigid lung tissue

e. Causes of reduced static compliance

i. Interstitial fibrosis (Fibrosing alveolitis)

ii. Atelectasis

iii. Pulmonary edema

iv. Pneumonia

v. ARDS

f. Reduced static compliance is usually also associated with a decreased dynamic compliance due to associated airway resistance

Increased static compliance indicates easily expandable lung Example – Emphysema

Extra Edge: Emphysema is associated with an increased static compliance but decreased dynamic compliance due to associated increased airway resistance

2). Dynamic compliance

a. Dynamic compliance indicates compliance when air flow is occurring

b. Dynamic compliance values reflect lung compliance along with airway resistance

c. Dynamic compliance is affected by both elasticity of the lung and airway resistance

d. Reduced Dynamic compliance (without change in static compliance) indicates ed airway resistance

i. Obstruction

ii. Bronchospasm (Allergic Asthma)

iii. Collapse of small airways etc

e. Reduced Dynamic compliance with reduced static compliance

f. Most conditions where static compliance is reduced are also associated with reduced dynamic compliance due to associated increase in airway resistance

Respiratory Flashcard List

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