Respiratory minute volume (or minute ventilation, or flow of gas) is the volume of air which can be inhaled (inhaled minute volume) or exhaled (exhaled minute volume) from a person's lungs in one minute. This is normally registered when a person has a ventilator supporting the person's breathing due to a sickness or injury.
Minute volume is calculated by taking the tidal volume and multiplying it by the respiratory rate (the number of breaths per minute a person is taking). The higher the minute volume the more carbon dioxide (CO2) the person is releasing, the converse is the lower the minute volume the lower the amount of carbon dioxide the person is releasing.[citation needed]
A normal minute volume is about 5–8 liters per minute in humans. Hyperventilation is the term for having an increased minute volume.
The symbol used to represent minute volume is 
or MV.
Tidal Volume x Respiratory Rate = Minute Volume
Relationship to other physiological rates
Minute volume is closely related to both alveolar ventilation and dead space ventilation. That is;
Where 
is alveolar ventilation, and 
represents dead space ventilation.
External links
- Overview at healthsystem.virginia.edu
- Overview at ccmtutorials.com
- Physiology at MCG 4/4ch3/s4ch3_15
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