The maximum instantaneous flow achieved during a FVC maneuverįorced inspiratory flow: (Specific measurement of the forced inspiratory curve is denoted by nomenclature analogous to that for the forced expiratory curve. Volume that has been exhaled at the end of the first second of forced expirationįorced expiratory flow related to some portion of the FVC curve modifiers refer to amount of FVC already exhaled ![]() Residual volume expressed as percent of TLCĪctual volume of the lung including the volume of the conducting airway.įorced vital capacity: the determination of the vital capacity from a maximally forced expiratory effortįorced expiratory volume (time): a generic term indicating the volume of air exhaled under forced conditions in the first t seconds Tidal volume: that volume of air moved into or out of the lungs during quiet breathing (VT indicates a subdivision of the lung when tidal volume is precisely measured, as in gas exchange calculation, the symbol TV or V T is used.)įunctional residual capacity: the volume in the lungs at the end-expiratory position Vital capacity: the volume of air breathed out after the deepest inhalation. Inspiratory vital capacity: the maximum volume of air inhaled from the point of maximum expiration Inspiratory capacity: the sum of IRV and TV Inspiratory reserve volume: the maximal volume that can be inhaled from the end-inspiratory level Residual volume: the volume of air remaining in the lungs after a maximal exhalationĮxpiratory reserve volume: the maximal volume of air that can be exhaled from the end-expiratory position Tidal volume: that volume of air moved into or out of the lungs during quiet breathing (TV indicates a subdivision of the lung when tidal volume is precisely measured, as in gas exchange calculation, the symbol TV or V T is used.) Total lung capacity: the volume in the lungs at maximal inflation, the sum of VC and RV. (Note the FEV1 value is arbitrary in this graph and just shown for illustrative purposes these values must be calculated as part of the procedure). After the starting point the curve rapidly mounts to a peak (the peak expiratory flow). The trace moves clockwise for expiration followed by inspiration. At the start of the test both flow and volume are equal to zero (representing the volume in the spirometer rather than the lung). Positive values represent expiration, negative values represent inspiration. It is about 6000 ml.Flow-Volume loop showing successful FVC maneuver. Total lung capacity- Maximum amount of air that can be held at any time in the two lungs, called total lung capacity. The average Residual Volume (RV) in healthy males is about 1200 ml. ![]() Residual volume- The volume of air that remains in the lungs even after maximum or forceful expiration. Vital capacity- The maximum amount of air a person can expel from the lungs after a maximum inhalation. Expiratory reserve volume- The expiratory reserve volume (ERV)is the additional air that can be forcibly exhaled after the expiration of a normal tidal volume. It is the additional air that can be forcibly inhaled after the inspiration of a normal tidal volume.ĥ. Inspiratory reserve volume- The inspiratory reserve volume (IRV), about 3,000 mL. Alveolar air- The tidal volume contained in alveoli. Dead air space- Some of the air in the trachea and bronchi do not take part in breathing, called dead air space. Tidal volume- The amount of air breathed in and out in normal quiet breathing.
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