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Medicine

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Respiratory

Question
1 out of 11
 

All the following are true about Chronic Bronchitis except: (AIIMS May 2013)



A Decreased FEV1

B Decreased MMEFR

C Increased RV

D Decreased diffusion capacity

Ans. D

Decreased diffusion capacity

Obstructive & Restrictive Airway Diseases

Obstructive pattern

Basic physiology:

1). During an obstruction in airways, there is decrease in expiratory flow which become more pronounced when expiration is more forceful.

2). Hallmark is decrease in expiratory flow rates.

3). FEV1 is markedly reduced and FVC is mildly reduced so that ratio of FEV1 / FVC is highly reduced.

4). Diffusion capacity is normal except emphysema where it is reduced.

Extra Edge:

Causes of Obstructive airway diseases:

1). Asthma

2). COPD

3). Bronchiectasis

4). Cystic Fibrosis

5). Bronchiolitis

Restrictive Pattern

1). Hallmark is decrease in TLC and VC (Reduce lung volume).

2). FEV1 is mildly reduced but FVC is highly reduced so that ratio of FEV1 / FVC is normal or increased.

3). Diffusion capacity is reduced.




Pattern

TLC

RV

VC

FEV1/FVC

Compliance

Obstructive

increased

Increased

Decreased

Decreased (<0.7)

Unchanged but Increased in emphysema

Restrictive

Decreased

Decreased

Decreased

Normal -increased

Highly reduced

Respiratory Flashcard List

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