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16 Cards in this Set

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What is tidal volume?
V(t); Volume of a normal breath at rest(average 500ml)
What is Inspiratory reserve volume?
(IRV); Additional volume of gas that can be inspired above the V(t).(average 3L)
What is Expiratory reserve volume?
(ERV); Volume of gas that can be forcefully expired after a normal passive expiration(average 1.3L)
What is Residual volume?
(RV); Volume of gas that remains after maximal expiration(average 1.5L)
How are lung volumes and capacities related?
Capacity= sum of 2 volumes.
What is total lung capacity?
Volume of gas present after a maximal inspiration(average 6L)
What is vital capacity?
(VC); Maximal volume that can be expelled after a maximal inspiration(average 4.5L)
What is functional residual capacity?
(FRC); Volume remaining at the end of a normal breath at rest(average 3L)
What are the volumes that make up the following capacities:
Inspiratory capacity (IC)
FRC
VC
TLC
IC=V(t) + IRV
FRC=RV+ERV
VC=ERV=V(t)+IRV
TLC=RV=ERV+V(t)+IRV
Which lung volumes and capacities are estimated?
RV, FRC, and TLC
How does age affect the following parameters of pulmonary function tests(PFTs)?
TLC
RV
VC
CV
FRC
TLC= decreased
RV= Increased
VC= Decreased
CV= Increased
FRC= No change
Define minute ventilation
(Ve).
Volume of air inspired or expired per minute.
What is the formula for minute ventilation expression?
V(e)=V(t)X frequency
What is Forced vital capacity?
(FVC); Volume exhaled with maximal expiratory effort
What is Forced expiratory volume in 1 second?
(FEV1); Volume that can be forcefully expired in 1 second.
What is the normal percentage of FEV1 per FVC?
75-80%(FEV1/FVC=0.8).