The Common Vein

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Spirometric values




FVC?Forced vital capacity; the total volume of air that can be exhaled during a maximal forced expiration effort.
Normal 80% to 120%



FEV1?Forced expiratory volume in one second; the volume of air exhaled in the first second under force after a maximal inhalation.
Normal 80% to 120%



FEV1/ FVC ratio?The percentage of the FVC expired in one second.
Within 5% of the predicted ratio



FEV6 ?Forced expiratory volume in six seconds.




FEF25?75%?Forced expiratory flow over the middle one half of the FVC; the average flow from the point at which 25 percent of the FVC has been exhaled to the point at which 75 percent of the FVC has been exhaled.




MVV?Maximal voluntary ventilation.




Lung volumes




ERV?Expiratory reserve volume; the maximal volume of air exhaled from end-expiration.




IRV?Inspiratory reserve volume; the maximal volume of air inhaled from end-inspiration.




RV?Residual volume; the volume of air remaining in the lungs after a maximal exhalation.
Normal 75%  -120%



VT ?Tidal volume; the volume of air inhaled or exhaled during each respiratory cycle.




Lung capacities




FRC?Functional residual capacity; the volume of air in the lungs at resting end-expiration.
75% to 120%



IC?Inspiratory capacity; the maximal volume of air that can be inhaled from the resting expiratory level.




TLC?Total lung capacity; the volume of air in the lungs at maximal inflation.
Normal 80% to 120%



VC?Vital capacity; the largest volume measured on complete exhalation after full inspiration.




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Spirometric values




FVC?Forced vital capacity; the total volume of air that can be exhaled during a maximal forced expiration effort.
Normal 80% to 120%



FEV1?Forced expiratory volume in one second; the volume of air exhaled in the first second under force after a maximal inhalation.
Normal 80% to 120%



FEV1/ FVC ratio?The percentage of the FVC expired in one second.
Within 5% of the predicted ratio



FEV6 ?Forced expiratory volume in six seconds.




FEF25?75%?Forced expiratory flow over the middle one half of the FVC; the average flow from the point at which 25 percent of the FVC has been exhaled to the point at which 75 percent of the FVC has been exhaled.




MVV?Maximal voluntary ventilation.




Lung volumes




ERV?Expiratory reserve volume; the maximal volume of air exhaled from end-expiration.




IRV?Inspiratory reserve volume; the maximal volume of air inhaled from end-inspiration.




RV?Residual volume; the volume of air remaining in the lungs after a maximal exhalation.
Normal 75%  -120%



VT ?Tidal volume; the volume of air inhaled or exhaled during each respiratory cycle.




Lung capacities




FRC?Functional residual capacity; the volume of air in the lungs at resting end-expiration.
75% to 120%



IC?Inspiratory capacity; the maximal volume of air that can be inhaled from the resting expiratory level.




TLC?Total lung capacity; the volume of air in the lungs at maximal inflation.
Normal 80% to 120%



VC?Vital capacity; the largest volume measured on complete exhalation after full inspiration.




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VC?Vital capacity; the largest volume measured on complete exhalation after full inspiration.

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VC?Vital capacity; the largest volume measured on complete exhalation after full inspiration.

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TLC?Total lung capacity; the volume of air in the lungs at maximal inflation.
Normal 80% to 120%
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TLC?Total lung capacity; the volume of air in the lungs at maximal inflation.
Normal 80% to 120%
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IC?Inspiratory capacity; the maximal volume of air that can be inhaled from the resting expiratory level.

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IC?Inspiratory capacity; the maximal volume of air that can be inhaled from the resting expiratory level.

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FRC?Functional residual capacity; the volume of air in the lungs at resting end-expiration.
75% to 120%
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FRC?Functional residual capacity; the volume of air in the lungs at resting end-expiration.
75% to 120%
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Lung capacities

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Lung capacities

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VT ?Tidal volume; the volume of air inhaled or exhaled during each respiratory cycle.

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VT ?Tidal volume; the volume of air inhaled or exhaled during each respiratory cycle.

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RV?Residual volume; the volume of air remaining in the lungs after a maximal exhalation.
Normal 75%  -120%
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RV?Residual volume; the volume of air remaining in the lungs after a maximal exhalation.
Normal 75%  -120%
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IRV?Inspiratory reserve volume; the maximal volume of air inhaled from end-inspiration.

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IRV?Inspiratory reserve volume; the maximal volume of air inhaled from end-inspiration.

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ERV?Expiratory reserve volume; the maximal volume of air exhaled from end-expiration.

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ERV?Expiratory reserve volume; the maximal volume of air exhaled from end-expiration.

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Lung volumes

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Lung volumes

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MVV?Maximal voluntary ventilation.

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MVV?Maximal voluntary ventilation.

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FEF25?75%?Forced expiratory flow over the middle one half of the FVC; the average flow from the point at which 25 percent of the FVC has been exhaled to the point at which 75 percent of the FVC has been exhaled.

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FEF25?75%?Forced expiratory flow over the middle one half of the FVC; the average flow from the point at which 25 percent of the FVC has been exhaled to the point at which 75 percent of the FVC has been exhaled.

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FEV6 ?Forced expiratory volume in six seconds.

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FEV6 ?Forced expiratory volume in six seconds.

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FEV1/ FVC ratio?The percentage of the FVC expired in one second.
Within 5% of the predicted ratio
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FEV1/ FVC ratio?The percentage of the FVC expired in one second.
Within 5% of the predicted ratio
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FEV1?Forced expiratory volume in one second; the volume of air exhaled in the first second under force after a maximal inhalation.
Normal 80% to 120%
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FEV1?Forced expiratory volume in one second; the volume of air exhaled in the first second under force after a maximal inhalation.
Normal 80% to 120%
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FVC?Forced vital capacity; the total volume of air that can be exhaled during a maximal forced expiration effort.
Normal 80% to 120%
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FVC?Forced vital capacity; the total volume of air that can be exhaled during a maximal forced expiration effort.
Normal 80% to 120%
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Spirometric values

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Spirometric values

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