physiological dead space


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physiological dead space

[‚fiz·ē·ə′läj·ə·kəl ′ded ‚spās]
(anatomy)
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2] increases where there is increased physiological dead space (alveoli are ventilated but not perfused) or where there is poor perfusion of the lungs.
2] measured by the volumetric capnograph, and physiological dead space is expressed as a fraction of the total tidal volume ([V.
In theory, the anatomic dead space is reduced by the presence of a tracheostomy and physiological dead space should not be affected.

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