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closing volume

   Also found in: Dictionary/thesaurus, Financial, Encyclopedia, Wikipedia, Hutchinson 0.21 sec.
closing volume
n.
The amount of air in the lungs at which the flow from the lower sections of the lungs becomes severely reduced or halts altogether during expiration.

closing volume (CV),
the volume of gas remaining in the lungs when the small airways begin to close during a controlled maximum exhalation.

closing volume
the volume of gas in the lungs in excess of the residual volume (RV) at the time when small airways in the dependent portions of the lungs close during maximal exhalation; abbreviated CV. CV normally increases with age and is also increased in obstructive airways disease. It can be used to detect the disease in high-risk patients before clinical signs appear. The closing capacity (CC) is equal to CV plus RV.


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manufacturer, we are focused on closing volume eVU orders and aggressively pursuing the monetization of our flash memory patent portfolio.
[1] Compared with the upright position, however, recumbent positions have well-documented deleterious effects on lung function, such as reduced lung volumes and capacities, increased closing volume of the dependent airways, reduced flow rates, and reduced arterial saturation.
 
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