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