Total Lung Ventilation

  • Total Lung Ventilation (V'total) refers to the total rate of air flow in and out of the lung during normal tidal breathing. The total lung ventilation is simply the product of the tidal volume and the Respiratory Rate (RR)
  • Formally: V'total = Vtidal * RR
  • However, from a functional perspective the total lung ventilation rate is of little physiological significance as a large percentage of the total ventilatory rate never reaches the gas exchange areas of the lung and remains in the dead space. The ventilatory rate of the gas exchange areas is instead referred to as the alveolar ventilation.