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