The minute ventilation is the total volume of air inspired and expired per minute.
minute ventilation in liters per minute =
= (0.863 * (volume of carbon dioxide expired per minute)) / (PaCO2 * (1 - ((dead space ventilation in liters per minute) / (tidal volume in liters per minute))))
where:
• Dead space ventilation per minute divided by the tidal volume per minute equals the dead space volume divided by the tidal volume, since the former reflect the latter times the breaths per minute
VE =
= (tidal volume) * (respiratory rate per minute)
where:
• The tidal volume is the volume of air inspired/expired during each respiratory cycle.
Interpretation:
• The normal minute ventilation is 4-6 liters per minute.
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