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Cardiopulmonary

Lung volumes and capacities

TermDefinition
Anatomic dead space volume (AD) The volume of air that occupies the non-respiratory conducting airways
Expiratory reserve volume (ERV) The volume of air that can be exhaled after a normal tidal exhalation. 15% of total lung volume
Forced expiratory volume (FEV) Volume of air exhaled in a specified period of time: usually the 1st, 2nd, and 3rd second of a forced vital capacity maneuver
Forced vital capacity (FVC) Volume of air expired from a forced maximal exhalation after a forced maximal inhalation
Functional residual capacity (FRC) Volume of air in the lungs after a normal exhalation. FRC = ERV + RV. About 40% of total lung volume
Inspiratory capacity (IC) Volume of air that can be inspired after a normal tidal exhalation. IC = TV + IRV. About 60% of total lung volume.
Inspiratory reserve volume (IRV) Volume of air that can be inspired after a normal tidal inspiration. 50% of total lung volume
Minute volume ventilation (VE) Volume of air expired in one minute. VE = TV x respiratory rate
Peak expiratory flow (PEF) Max flow of air during the beginning of a forced maximal expiration
Residual volume (RV) Volume of gas in the lungs after a maximal expiration. 25% of total lung volume
Tidal volume (TV) Total volume inspired and expired w/ each breath during quiet breathing. 10% of total lung volume.
Total lung capacity (TLC) Volume of air in the lungs after a maximal inspiration; sum of all lung volumes. TLC = RV + VC or TLC = FRC + IC
Vital capacity (VC) Volume change that occurs between maximal inspiration and maximal expiration. VC = TV + IRV + ERV. 75% of total lung volume.
Created by: glopez111