bronchitis increases RV

[faisal 2000]

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why bronchitis rarely causes high residual volume

 

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In COPD (emphysema/chronic bronchitis) you have destruction of the alveoli and/or constant air trapping and lung hyperinflation. Because of that the residual volume (RV) increases permanently. On the contrast in asthma for example the bronchial obstruction is reversible, thus the RV is generally not changed (i.e. normal). However would you perform a spirometry during an asthma attack you would of course see increased RV.

I hope that answers your question.

 

[faisal 2000]

In COPD (emphysema/chronic bronchitis) you have destruction of the alveoli and/or constant air trapping and lung hyperinflation. Because of that the residual volume (RV) increases permanently. On the contrast in asthma for example the bronchial obstruction is reversible, thus the RV is generally not changed (i.e. normal). However would you perform a spirometry during an asthma attack you would of course see increased RV.

I hope that answers your question.

 

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Well according to that link it seems that chronic bronchitis does not cause enough air trapping to produce increased RV. However I cannot recall a single question that I have encountered (among ~7000 questions) where chronic bronchitis does not cause increased RV. FA also states that obstructive lung diseases = incr RV. So for exam purposes thats what I´ll go with.