VD/VT

In medicine, the ratio of physiologic dead space over tidal volume (VD/VT) is a routine measurement, expressing the ratio of dead-space ventilation (VD) to tidal ventilation (VT), as in physiologic research or the care of patients with respiratory disease.[1]

Equation
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References
  1. Raymond LW (1978). "The alveolar air equation abbreviated". Chest. 74 (6): 675–6. doi:10.1378/chest.74.6.675. PMID 738126.


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