Dynamic Spirometry

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Dynamic Spirometry
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Static test

• Performed without regard to time
• Relaxed Vital capacity Volume of expired air
  measured after a maximal inspiration

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Forced Expiratory Curve

• The subject takes a maximal inspiration and then
  exhales as rapidly, as forcibly, as maximally as
  possible.
• A plot of volume against time

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• Value may decline to 60 in old age.
• Nl values vary with sex, height, race.

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• Obstructive lung disease

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A
4
B
Expired Volume (l)
FVC
3
2
1
0
2
4
5
3
1
Time (s)
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• Restrictive lung disease

5
A
4
Expired Volume (l)
3
C
2
1
0
2
4
5
3
1
Time (s)
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5
A
4
B
Expired Volume (l)
3
C
2
1
0
2
4
5
3
1
Time (s)
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Volume Normal Obstructive Restrictive
FVC 5 ? or ? (5) ? (3)
FEV1 4 ??? (2) ? (2.7)
FEV1 80 ? (40) ? or ? (90)
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Flow Volume loop
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• This measures exp insp flow as a function of
  exhaled volume rather then against time.

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Flow Volume loop
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Obstructive LD
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Restrictive LD
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Importance of spirometry
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Thank You