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.

wasted ventilation

the volume of air that ventilates the physiological dead space in the respiratory system.

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 CO2 and in this sense are not entirely wasted ventilation.