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PFT Study Guide With 100% Correct Answers
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PFT Study Guide With 100% Correct Answers
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PFT Study Guide With 100% CorrectAnswers
Purpose of performing pulmonary function tests (PFTs) CORRECT ANSWERS -
Functional *status* of the *lungs*
- *How MUCH & how FAST GAS* can be moved into and out of the lungs
- *Diffusion characteristics* of the alveolar-capillary membrane
*the tests can dx. lung diseases & measure the severity of the disease*
Contraindications include: CORRECT ANSWERS - pneumothorax (untreated)
- hemoptysis
- cardiovascular disease
- cataract removal surgery (ocular pressure)
Pulmonary function devices that collect and measure GAS volumes CORRECT
ANSWERS - water sealed spirometer
- bellows spirometer
- dry-rolling-seal spirometer
Lung volumes CORRECT ANSWERS how much air your lungs can hold
Spirometry determines CORRECT ANSWERS how quickly you can move air in & out of
your lungs
Diffusing capacity CORRECT ANSWERS how well your lungs add oxygen & remove
carbon dioxide
Parameters to establish normal values for PFTs CORRECT ANSWERS -*G*ender
-*H*eight
-*R*ace
- Age
What is the most important factor influencing lung size and predicted values?
CORRECT ANSWERS *Height*
the taller the person, the larger are predicted lung volumes, flow rates, and diffusing
capacity.
Lung volumes and flow rates are affected typically when the BMI is greater than:
CORRECT ANSWERS *BMI>30*
as a person gains weight, lung volumes and flow rates do not changes until the person
becomes obese (BMI>30)
, The instrument used primarily in PFT CORRECT ANSWERS Spirometer (for measuring
routine *flows* & *volumes*)
Standard equipment in a pulmonary function laboratory CORRECT ANSWERS -
Spirometer
- Gas analyzer
- Body plethysmograph
What is the volume of air inhaled and exhaled during quiet breathing? CORRECT
ANSWERS tidal volume (Vt)
Normal minute ventilation of an average person at rest CORRECT ANSWERS 4 to 12
L/min
(depending of the size of the pt.)
Why is proper coaching of the pt. during FVC maneuver extremely important?
CORRECT ANSWERS *ERRONEOUS FVC* test results
(most common)
Restrictive lung disorders reduce FVC by CORRECT ANSWERS shrinking the lung
(decrease in lung size)
Obstructive lung disorders reduce FVC by CORRECT ANSWERS increase in RV
(caused by air trapping)
If measured FVC is significantly smaller than SVC, what is occurring? CORRECT
ANSWERS air trapping
What level of VC is associated with *increased risk of postoperative respiratory
complications*? CORRECT ANSWERS <20 ml/kg
(reduced VC)
What level of VC is associated with *increased risk of respiratory failure*? CORRECT
ANSWERS <15 ml/kg
indicates that the ventilatory reserve is decreased enough to cause resp. failure
Total lung capacity (TLC) is a function of the persons CORRECT ANSWERS - *A*ge
- *R*ace
_ *G*ender
- *S*ize
*reported as the Measured volume and as % Predicted*
The body plethysmograph uses which gas law? CORRECT ANSWERS Boyles law
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