Lung volumes: Difference between revisions
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There are several different measures of lung volumes, some of which can be taken by Spirometry. They are | There are several different measures of lung volumes, some of which can be taken by Spirometry <ref>http://www.frca.co.uk/article.aspx?articleid=100023</ref>. They are: | ||
<br> | #Tidal Volume (TV)<br>The volume of air inspired and expired over the course of a normal breath. This is around 500 ml | ||
#Inspiratory Reserve Volume (IRV)<br>The volume of air that can be inspired over and above that of a normal (tidal volume) breath. This is around 3100 ml | |||
#Expiratory Reserve Volume (ERV)<br>The Volume of air that can be expired over and above that of a normal breath. This is around 1200 ml | |||
#Residual Volume (RV)<br>The volume of air that is left in the lungs after maximal expiration; that is after the expiratory reserve volume. It is around 1200 ml but cannot be measured by spirometry. | |||
#Inspiratory Capasity (IC)<br>The volume of maximal inspiration: IRV+TV | |||
#Functional residual capasity (FRC)<br>The volume of gas remaining in the lung after normal expiration: ERV+RV | |||
#Vital capasity (VC)<br>Volume of maximal inspiration and expiration: IRV+ERV+TV | |||
#Total lung capasity (TLC)<br>The volume of the lung after maximal inspiration sum of all four lung volumes, IC+FRC<br> | |||
=== References === | |||
<references /> | |||
Latest revision as of 23:16, 25 October 2013
There are several different measures of lung volumes, some of which can be taken by Spirometry [1]. They are:
- Tidal Volume (TV)
The volume of air inspired and expired over the course of a normal breath. This is around 500 ml - Inspiratory Reserve Volume (IRV)
The volume of air that can be inspired over and above that of a normal (tidal volume) breath. This is around 3100 ml - Expiratory Reserve Volume (ERV)
The Volume of air that can be expired over and above that of a normal breath. This is around 1200 ml - Residual Volume (RV)
The volume of air that is left in the lungs after maximal expiration; that is after the expiratory reserve volume. It is around 1200 ml but cannot be measured by spirometry. - Inspiratory Capasity (IC)
The volume of maximal inspiration: IRV+TV - Functional residual capasity (FRC)
The volume of gas remaining in the lung after normal expiration: ERV+RV - Vital capasity (VC)
Volume of maximal inspiration and expiration: IRV+ERV+TV - Total lung capasity (TLC)
The volume of the lung after maximal inspiration sum of all four lung volumes, IC+FRC