Expiratory reserve volume
Expiratory Reserve Volume
Expiratory reserve volume (ERV) is the additional amount of air that can be expired from the lungs by determined effort after normal expiration.
Pronunciation
- IPA: /ɪkˈspaɪrətɔːri rɪˈzɜːrv ˈvɒljuːm/
Etymology
The term is derived from the Latin words "exspirare" meaning "to breathe out", "reservare" meaning "to keep back", and "volumen" meaning "a roll or scroll", which in this context refers to the volume of air.
Definition
The Expiratory Reserve Volume (ERV) is the maximum volume of air that can be forcibly exhaled after a normal tidal volume exhalation. This is the reserve amount that can be exhaled beyond what would be normal.
Measurement
The ERV is typically measured as part of a full spirometry test, which also measures tidal volume (TV), inspiratory reserve volume (IRV), and vital capacity (VC).
Related Terms
- Tidal Volume: The amount of air which enters the lungs during normal inhalation at rest.
- Inspiratory Reserve Volume: The maximum amount of additional air that can be inhaled after a normal inhalation.
- Vital Capacity: The total volume of air that can be exhaled after maximum inhalation.
- Residual Volume: The volume of air still remaining in the lungs after the expiratory reserve volume is exhaled.
See Also
External links
- Medical encyclopedia article on Expiratory reserve volume
- Wikipedia's article - Expiratory reserve volume
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