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.
Dictionary of Military and Associated Terms. US Department of Defense 2005.
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References in periodicals archive ?
Marked declines in the PaC02 occur by increased tidal volumes as well as dilution or washout of the C02 in the anatomical dead space. CPAP can produce both of these effects.
Endotracheal tubes (ETT) reduce anatomical dead space by approximately 50% but can elevate airway resistance due to the small internal diameter of endotracheal tubes.
Usually, these tidal volumes end up being less than the patient's anatomical dead space, which is especially important if the patient being ventilated has non-compliant or stiff lungs, in which case conventional mechanical ventilation is likely to cause barotrauma due to overdistension.