dead space

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Related to anatomical dead space: alveolar dead space

dead space

1. An area within the maximum range of a weapon, radar, or observer, which cannot be covered by fire or observation from a particular position because of intervening obstacles, the nature of the ground, or the characteristics of the trajectory, or the limitations of the pointing capabilities of the weapon.
2. An area or zone which is within range of a radio transmitter, but in which a signal is not received.
3. The volume of space above and around a gun or guided missile system into which it cannot fire because of mechanical or electronic limitations.
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References in periodicals archive ?
Studies conducted in cadavers reveal that a tracheostomy decreases anatomical dead space volume by about half (9).
Marked declines in the PaC02 occur by increased tidal volumes as well as dilution or washout of the C02 in the anatomical dead space.
Endotracheal tubes (ETT) reduce anatomical dead space by approximately 50% but can elevate airway resistance due to the small internal diameter of endotracheal tubes.