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16 Cards in this Set
- Front
- Back
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What is tidal volume?
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V(t); Volume of a normal breath at rest(average 500ml)
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What is Inspiratory reserve volume?
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(IRV); Additional volume of gas that can be inspired above the V(t).(average 3L)
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What is Expiratory reserve volume?
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(ERV); Volume of gas that can be forcefully expired after a normal passive expiration(average 1.3L)
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What is Residual volume?
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(RV); Volume of gas that remains after maximal expiration(average 1.5L)
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How are lung volumes and capacities related?
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Capacity= sum of 2 volumes.
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What is total lung capacity?
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Volume of gas present after a maximal inspiration(average 6L)
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What is vital capacity?
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(VC); Maximal volume that can be expelled after a maximal inspiration(average 4.5L)
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What is functional residual capacity?
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(FRC); Volume remaining at the end of a normal breath at rest(average 3L)
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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 |
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Which lung volumes and capacities are estimated?
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RV, FRC, and TLC
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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 |
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Define minute ventilation
(Ve). |
Volume of air inspired or expired per minute.
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What is the formula for minute ventilation expression?
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V(e)=V(t)X frequency
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What is Forced vital capacity?
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(FVC); Volume exhaled with maximal expiratory effort
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What is Forced expiratory volume in 1 second?
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(FEV1); Volume that can be forcefully expired in 1 second.
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What is the normal percentage of FEV1 per FVC?
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75-80%(FEV1/FVC=0.8).
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