Lung Volumes and Capacities Flashcards
Anatomic Dead Space Volume (VD)
Volume of air that occupies the non-respiratory conducting airways
Expiratory Reserve Volume (ERV), % of total lung volume, and equation
Max volume of air that can be exhaled a normal tidal exhalation
Makes up 15% of total lung volume
Forced Expiratory Volume (FEV)
Max volume of air exhaled in a specific period of time: usually in 1, 2, or 3 seconds
Forced Vital Capacity (FVC)
Volume of air expired during a forced maximal expiration after a forced maximal inspiration
Vital Capacity (VC), % of total lung volume, and equation
Volume change that occurs between a maximal inspiration and maximal expiration
Accounts for 75% of total lung volume
VC = TV + IRV + ERV
Functional Residual Capacity (FRC), % of total lung volume, and equation
Volume of air left in the lungs after a normal exhalation.
Accounts for 40% of total lung volume
FRC = ERV + RV
Inspiratory Capacity (IC), % of total lung volume, and equation
Max volume of air that can be inspired after a normal tidal EXHALATION
Accounts for 60% of total lung volume
IC = RV + IRV
Inspiratory Reserve Volume (IRV)
Max volume of air that can be inspired after a normal tidal INSPIRATION
Accounts for 50% of total lung volume
Minute Volume Ventilation (VE) and equation
Volume of air expired in one minute
VE = TV x respiration rate
Peak Expiratory Flow (PEF)
Max flow of air during the beginning of a forced expiratory maneuver
Residual Volume (RV) and % of total lung volume
Volume of gas remaining in the lungs at the end of max EXPIRATION
Accounts for 25% of total lung volume
Tidal Volume (TV) and % of total lung volume
Volume of air inhaled/exhaled in normal quiet breathing
Accounts for 10% of total lung volume
Total Lung Capacity (TLC) and equation
Volume of air in lungs after a maximal INSPIRATION; aka the sum of all lung volumes
TLC = RV + VC or TLC = FRC + IC
