Calculating % Decrease in FEV1 Levels Quiz
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Questions and Answers

What is the recommended timing method for conducting the single-breath DLCO maneuver?

  • Smith and Johnson method
  • Jones and Meade method (correct)
  • Brown and Miller method
  • Taylor and Clark method

    • What is the acceptable timeframe for rapid inspiration to TLC from RV during the DLCO maneuver?

  • 5-8 seconds
  • > 15 seconds
  • 10-12 seconds
  • < 4 seconds (correct)

    • How much volume should be inspired during the DLCO maneuver relative to VC?

  • ~50% of VC
  • ~70% of VC
  • ~85% of VC (correct)
  • ~100% of VC

    • What is the recommended dead space washout volume during the DLCO maneuver?

    <p>0.75 - 1.0 L</p> Signup and view all the answers

    What is the acceptable timeframe for collecting the alveolar gas sample during the DLCO maneuver?

    <p>&lt; 3 seconds</p> Signup and view all the answers

    How much time should be allowed between DLCO tests?

    <p>4 minutes</p> Signup and view all the answers

    What is the formula to calculate % decrease in FEV1?

    <p>(X-Y)/X * 100</p> Signup and view all the answers

    What is an indicator to stop the test during bronchial challenge testing?

    <p>35%-45% decrease in sGaw</p> Signup and view all the answers

    Which value is used to calculate the fraction of medication delivered to the lower airways?

    <p>SVN output per minute</p> Signup and view all the answers

    What should be monitored if FEV1 is not sensitive in some asthmatics?

    <p>sGaw</p> Signup and view all the answers

    Which parameter requires knowledge of TI/Ttot for its calculation?

    <p>sGaw</p> Signup and view all the answers

    What does a decrease in sGaw of 35%-45% indicate during a test?

    <p>Patient has large airway changes</p> Signup and view all the answers

    How is the FRC calculated in the Open Circuit Multiple Breath N2 Washout test?

    <p>FRC = FEN2final x (Expired Volume – N2tissue)</p> Signup and view all the answers

    What is the purpose of correcting for 'N2tissue' in the FRC calculation?

    <p>To adjust for the volume of nitrogen washed out of blood and tissues</p> Signup and view all the answers

    What assumption is made in the Closed-Circuit/Multiple-Breath Helium (He) Dilution test?

    <p>Equilibration of helium can occur between the spirometer and the lungs</p> Signup and view all the answers

    What is added to the spirometer initially in the Closed-Circuit/Multiple-Breath Helium (He) Dilution test?

    <p>Air and then helium</p> Signup and view all the answers

    Why is oxygen added to the system in the Closed-Circuit/Multiple-Breath Helium (He) Dilution test?

    <p>To maintain FiO2 near or above 0.21</p> Signup and view all the answers

    How long does it usually take for equilibration of helium concentration between the lungs and rebreathing system in the Closed-Circuit/Multiple-Breath Helium (He) Dilution test?

    <p>~3 minutes</p> Signup and view all the answers

    What can cause an overestimation of FRC using dilutional techniques?

    <p>Leakage in breathing circuits</p> Signup and view all the answers

    Which element is crucial for accurately measuring FRC using dilutional techniques?

    <p>End expiratory level</p> Signup and view all the answers

    In pulmonary function testing, which value indicates the severity of obstruction?

    <p>FEV1/FVC ratio</p> Signup and view all the answers

    Which step is recommended in the evaluation process of pulmonary function testing following the review of graphs?

    <p>Evaluate FEV1/FVC ratio</p> Signup and view all the answers

    What can a 20% - 30% increase in FEF25%-75% indicate during pulmonary function testing?

    <p>Positive response</p> Signup and view all the answers

    What is the significance of a decrease in FEV1/FVC ratio?

    <p>Suggestive of severe obstruction</p> Signup and view all the answers

    In obstructive lung diseases affecting medium and smaller airways, what shape does the expiratory limb of the flow volume loop take?

    <p>Concave</p> Signup and view all the answers

    Which type of obstruction is characterized by decreased flow rates on both inhalation and exhalation with a square-like appearance in the flow volume loop?

    <p>Fixed obstruction</p> Signup and view all the answers

    What causes the intrathoracic variable obstruction to have normal inspiratory flows but flattened expiratory flows?

    <p>High pleural pressures during expiration</p> Signup and view all the answers

    Which condition is an example of a fixed obstruction?

    <p>Tracheal stenosis</p> Signup and view all the answers

    What mnemonic is used to differentiate variable extrathoracic and variable intrathoracic obstruction?

    <p>&quot;What's in is out, and what's out is in.&quot;</p> Signup and view all the answers

    What effect does obstructive lung disease have on expiratory flow rates?

    <p>Decreases them</p> Signup and view all the answers

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