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Functional residual capacity (FRC) is the volume of air present in the lungs at the end of passive expiration. [1] At FRC, the opposing elastic recoil forces of the lungs and chest wall are in equilibrium and there is no exertion by the diaphragm or other respiratory muscles.
A lung's capacity consists of two or more lung volumes. The lung volumes are tidal volume (V T), inspiratory reserve volume (IRV), expiratory reserve volume (ERV), and residual volume (RV). The four lung capacities are total lung capacity (TLC), inspiratory capacity (IC), functional residual capacity (FRC) and vital capacity (VC).
Functional residual capacity drops 18–20%, [9] typically falling from 1.7 to 1.35 litres, [citation needed] due to the compression of the diaphragm by the uterus. [citation needed] The compression also causes a decreased total lung capacity (TLC) by 5% [9] and decreased expiratory reserve volume by 20%. [9]
Pulmonary plethysmographs are commonly used to measure the functional residual capacity (FRC) of the lungs—the volume in the lungs when the muscles of respiration are relaxed—and total lung capacity. [2]
The extent to which the existing improvements differ from the highest and best use as-if vacant, reveals the extent of any functional obsolescence. Further, there are three potential actions that can be undertaken regarding the existing improvements: Retention of the existing improvements, modification of the improvements or the development ...
Functional residual capacity: the volume in the lungs at the end-expiratory position: RV/TLC% Residual volume expressed as percent of TLC: V A: Alveolar gas volume: V L: Actual volume of the lung including the volume of the conducting airway. FVC: Forced vital capacity: the determination of the vital capacity from a maximally forced expiratory ...
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The helium dilution technique is the way of measuring the functional residual capacity of the lungs (the volume left in the lungs after normal expiration). This technique is a closed-circuit system where a spirometer is filled with a mixture of helium (He) and oxygen. The amount of He in the spirometer is known at the beginning of the test ...