pft 3

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pft 3
2011-04-19 13:11:07

pft 3
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  1. define force vital capacity
    vol that can be expired forcefully and as rapidly as possible after a maximum inspiration
  2. describe how the RT should instruct a pt to perform a FVC maneuver
    take a maximal inspiration follwed by a maximal exhilation as forecefully and rapidly as poss
  3. a FVC maneuver will provide ___ needed to measure ____ disease
    • flow rates
    • obstructive
  4. what flowrates can be measure when a forced VC is recorded
    • FEV 1.0 = forced exp vol in 1 sec
    • FEF 200-1200
    • FEF 25-75
    • PEFR
  5. what is the best flowrate to use to monitor obstructive disease
    FEV 1.0
  6. what is the minimum acceptable value for the FEV1/FVC ratio
  7. a decreased ___ is the best indicator of __ disease
    • FEV 1.0
    • obstructive
  8. what does a normal FEV1/FVC ratio indicate
    not obstructive disease - may still be resitrictive
  9. if the FEV1 is decreased and the FEV1/FVC ratio is normal, what is the correct interpretation
    pt has restrictive disease only
  10. a decreased maximum voluntary ventilation MVV would signify
    • dec obs disease
    • inc airway resistance
    • muscle weakness
    • dec compliance
    • poor pt effort
  11. all bronchodilator therapy should be held ))) hours prior to PFT
    8 hours
  12. what minimum increase in FEV1 indicates that the pt responded to the bronchodilator
    12% and 200ml
  13. list the three methods available to determine functional residual capacity
    • he dilution (closed method)
    • n2 washout (open method)
    • plethysmopgraphy/body box
  14. what three values can a body box measure that the other methods cannot
    • gases trapped inside the lung
    • airway resistance (.6-2.4 cmh20)
    • compliance (60-100 ml/cmh20)
  15. what is the normal value for diffusion capacity