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
[edit]![{\displaystyle {\frac {V_{D}}{V_{T}}}={\frac {P_{a}{\mathrm {CO} {\vphantom {A}}_{\smash[{t}]{2}}}-P_{E}{\mathrm {CO} {\vphantom {A}}_{\smash[{t}]{2}}}}{P_{a}{\mathrm {CO} {\vphantom {A}}_{\smash[{t}]{2}}}}}}](https://wikimedia.org/api/rest_v1/media/math/render/svg/7993e66be34e8568016d57a23d38f3dd08a3fd0a)
References
[edit]- ↑ Raymond LW (1978). "The alveolar air equation abbreviated". Chest. 74 (6): 675–6. doi:10.1378/chest.74.6.675. PMID 738126.