![]() With this technique you can make a diagram where it shows when small airways begin to close. ![]() Most common method to determine CC/CV is a single breath nitrogen washout, also called a Fowler’s method. There are three ways we can determine the RVĬlosing volume (CV) is the lung volume at which airway closure begins to occur and closing capacity (CC) is CV + RV. To measure RV we need to do specialized testing. Without being able to directly measure RV we cannot measure FRC or TLC either, since these capacities include RV. We can measure all lung volumes with the exception of RV. Only by exerted effort are we able to exhale to this point (RV). We are not able to exhale below the residual volume (RV), which therefore become the smallest amount of gas we have in the lungs at all time. Normal respiration is moving air in and out of the lungs using just the tidal volume (TV). ![]() There are four standard lung volumes (which are not subdivided)Īnd four standard lung capacities, which consists of two or more standard lung volumes in combination ![]() But, you can make specialized test to determine CC and CV.įirst let’s back up a little and establish our parameters within respiratory physiology. Question: In a spirometry diagram where would I locate the closing volume and closing capacity?Īnswer: Normally you will not be able to locate closing capacity (CC) or closing volume (CV) on a spirometry diagram. ![]()
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