Exam (elaborations)
CLUSTER 1 DIAGNOSTICS PFT EXAM 2024/2025
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CLUSTER 1 DIAGNOSTICS PFT EXAM 2024/2025
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Which of the following values is most commonly used to evaluate anindividual's response to bronchodilator?
a. FVC
b. FEV1
c. FEF25-75%
d. Diffusing capacity - Precise Answer ✔✔b. FEV1
Among the common parameters of the spirometric measurements, FEV1
is considered to be the determinant o obstructive pathologies supported
by the decreased FEV1%. Also, it is the first parameter taken into
considerati bronchodilator challenge is done. A 15% change from FEV1
baseline value after bronchodilator response indicates positive result
Following an FCV maneuver, the flow rate is considered the least effort
dependent is the:
a. FEV1
b. FEF 200-1200
c. FEF 25-75
d. MVV - Precise Answer ✔✔c. FEF 25-75
Among the following flow rate, the least effort dependent is the FEF 25-
75%. FEF 25% -75% is measured from a segment of the FVC that
includes flow from medium and small airways
Lung volumes and capacities are indicated:
,a. Assess response to exercise training
b. Whenever simple spirometry is performed
c. Diagnosing restrictive lung diseases
d. When hypoxemia is suspected - Precise Answer ✔✔c. Diagnosing
restrictive lung diseases
Measurements of flow rates are used in diagnosing obstructive diseases
for the reason that flow is the first affected aspect in obstructive
pathologies while on the other hand lung volumes and capacities are
primarily indicated for restrictive pathologies.
IRV: 1200 mL, VT: 500 mL, ERV: 1000 mL. Based on the values given,
what is the TLC?
a. 1700 mL
b. 1700 mL plus RV
c. 2700 mL plus RV
d. 2700 mL minus RV - Precise Answer ✔✔c. 2700 mL plus RV
TLC = IRV + VT + ERV + RV
TLC = 6000 mL
Volume of air in the lungs after a maximum inspiration
Maximal Inspiratory Pressure is a measurement used to assess a
patient's:
a. Ventilator status
,b. Pulmonary mechanics
c. Oxygenation status
d. Acid base balance - Precise Answer ✔✔b. Pulmonary mechanics
The lowest pressure developed during a forceful Inspiration against an
occluded airway and primarily measures inspiratory muscle strength.
- Healthy adults >-60 cmH2O
What percent decrease in FEV1 needs to occur before concluding that
the patient has airway hyperreactivity?
a. 15%
b. 20%
c. 10%
d. 25% - Precise Answer ✔✔b. 20%
Bronchoprovocation or Metacholine Challenge Test is a diagnostic
procedure to determine AHR (Airway Hyperreactivity) using different
methods that will induce bronchospasm. A change or decrease of 20%
from the baseline value of FEV1 Is considered positive result and may
declare the presence of asthma.
Significant bronchodilator response is demonstrated by how many
percent change in FEV1?
a. 15%
b. 20%
, c. 10%
d. 25% - Precise Answer ✔✔a. 15%
Bronchodilation Challenge is done to determine the patient's response to
bronchodilator. First, baseline values will be taken specifically the
FEV1. Secondly, the RT will administer a beta-2 adrenergic
bronchodilator. Lastly, the RT will perform FVC maneuver and a 15%
change from the baseline value of FEV1 is considered a positive result.
A correctly performed nitrogen washout test requires that the test last
for:
a. 7 minutes and/or a final N2 concentration of 10% is measured
b. 10 minutes and/or until a final N2 concentration of 5% is measured
c. A final concentration of 10% is measured for 3 successive breaths
d. A final N2 concentration of 1.5% is measured for 3 successive breaths
- Precise Answer ✔✔d. A final N2 concentration of 1.5% is measured
for 3 successive breaths
When the peak exhaled concentration of N2 is less than 1.5%, the
patient exhales completely and the Fractional concentration of alveolar
nitrogen is noted.
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