Respiratory Definitions Flashcards
Equal pressure point (EPP)
The point at which the pressure inside the airway equals the pressure outside of the airway (ie. Ppi)
Expiratory reserve volume (ERV)
the maximum volume of air exhaled at the end of the tidal volume
Forced Expiratory flow (FEF)
the maximum midexpiratory flow rate, measure by drawing a line between points representing 25% and 75% if the forced vital capacity
Forced expiratory volume (FEV)
the maximum volume of air forcibly exhaled in 1 s
Forced expired volume/forced vital capacity ratio (FEV/FVC%)
the percentage of FVC forcibly exhaled in 1s
Functional residual capacity (FRC)
The volume of air remaining in the lungs at the end of a normal tidal volume
Forced vital capacity (FVC)
The maximum volume of air forcibly exhaled after a maximum inhalation
Inspiratory capacity (IC)
the maximum volume of air inhaled after a normal expiration
Inspiratory reserve volume (IRV)
the maximum volume of air inhaled at the end of a normal inspiration
Peak expiratory flow (PEF)
the maximal expiratory flow during an FVC manuever
Residual volume (RV)
the volume of air remaining in the lungs after the maximum expiration
Residual volume/total lung capacity ratio (RV/TLC)
the percentage of total lung capacity made up of residual volume
total lung capacity (TLC)
the volume of air in the lungs at the end of the end of the maximum of inspiration
vital capacity (VC)
the maximum volume of air that can be exhaled (note that the values for FVC and VC are the same). VC is calculated from static lung volume (VC = ERV + VT + IRV). FVC is determined from direct
dead space- tidal volume ratio (Vo/Vt)
the fraction of tidal volume made up of dead space
