Question

Expiratory phase is prolonged in asthma, chronic bronchitis and emphysema due to:

1. chronic hypoxia drive
2. thickening / narrowing of the airways
3. low V/Q balance
4. air trapping
5. tachypnea

Answer 1

ANSWER) b) thinking/ narrowing of the airways.

EXPLAINATION -

Asthma, chronic bronchitis and emphysema are COPD(chronic obstructive pulmonary disease).

COPD are diseases of pulmonary system that all have obstruction of airway by different pathogenesis.

Airflow limitation during the expiratory phase in airway obstructive disease causes prolonged expiration, which is one of the hallmarks of COPD.

Due to narrowing of airway the expiratory phase in all these copd disease is prolonged.

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