wasted ventilation

wast·ed ven·ti·la·tion

that part of pulmonary ventilation that is ineffective in exchanging oxygen and carbon dioxide with pulmonary capillary blood; calculated as physiologic dead space multiplied by respiratory frequency.

wast·ed ven·ti·la·tion

(wāstĕd ven'ti-lāshŭn)
That part of pulmonary ventilation that is ineffective in exchanging oxygen and carbon dioxide with pulmonary capillary blood; calculated as physiologic dead space multiplied by respiratory frequency.
References in periodicals archive ?
It was only a little later that several papers were published showing that bronchopleural fistulae--while seldom so effective as in this case--do indeed eliminate C02 and in this sense are not entirely wasted ventilation. In fact, this patient had "flow through" ventilation so efficient as to meet all of his ventilation needs and then some.
In COPD, however, V/Q mismatch occurs and can lead to wasted ventilation, increased PaC[O.sub.2].
It was only a little later that several papers were published showing that bronchopleural fistulae--while seldom so effective as in this case--do indeed eliminate CO2 and in this sense are not entirely wasted ventilation. In fact, this patient had "flow through" ventilation so efficient as to meet all of his ventilation needs and then some.