Ventilation (physiology)
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2008-05-11T03:15:10Z
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{{otheruses3|Ventilation}}
In [[respiratory physiology]], '''ventilation''' (or '''ventilation rate''') is the rate at which gas enters or leaves the [[lung]]. It is categorised under the following definitions:
{| class="wikitable"
| '''Measurement''' || '''Symbol''' || '''Equation''' || '''Description'''
|-
| ''[[Minute ventilation]]'' || <math> \dot{V} </math> || = [[tidal volume]] * [[respiratory rate]]<ref name="virginia">[http://www.healthsystem.virginia.edu/Internet/Anesthesiology-Elective/airway/ventilation.cfm Respiratory Physiology: Ventilation<!-- Bot generated title -->]</ref><ref>[http://www.nda.ox.ac.uk/wfsa/html/u12/u1211_02.htm Respiratory Physiology (page 2)<!-- Bot generated title -->]</ref> || the total volume of gas entering the lungs per minute.
|-
| ''[[Alveolar ventilation]]'' || <math> \dot{V}_A </math>|| = ([[tidal volume]] - [[dead space]]) * [[respiratory rate]] <ref name="virginia"> </ref> || the volume of gas per unit time that reaches the [[alveolus|alveoli]], the respiratory portions of the lungs where gas exchange occurs.
|-
| ''Dead space ventilation'' || <math> \dot{V}_D </math>|| = [[dead space]] * [[respiratory rate]]<ref>{{GeorgiaPhysiology|4/4ch3/s4ch3_16}}</ref>
|| is the volume of gas per unit time that does not reach these respiratory portions, but instead remains in the airways ([[Vertebrate trachea|trachea]], [[bronchi]], etc.).
|}
== See also ==
*[[Gas exchange]]
*[[Fowler method]]
==References==
<references/>
==External links==
* {{MeshName|Pulmonary+ventilation}}
*[http://www.rtcorner.net RT Corner (Educational Site for RT's and Nurses)] at rtcorner.net
{{Respiratory physiology}}
[[Category:Respiration]]
{{biology-stub}}