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NBRC Review – PFTs Questions and Answers 100% Solved
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NBRC Review – PFTs Questions and Answers 100% Solved
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NBRC Review – PFTs Questions and Answers 100%Solved
galvanic fuel cells Correct Ans-- *accuracy can be affected by water on the sensor, high
system pressures and changes in altitude*
- if unable to calibrate, change fuel cell
polarographic fuel cell Correct Ans-- analogous to Clark electrode
- has battery used to polarize electrodes
- accuracy affected by altitude, water, and high pressure
- if unable to calibrate, change battery and check electrolyte level (refill if low)
troubleshooting O2 analyzer Correct Ans-- if analyzer reads higher or lower, recalibrate
analyzer then recheck equipment
- must be accurate within 2% of known value
helium analyzer Correct Ans-*thermal conductivity (wheatstone bridge)*
- measures percentage
- calibrate to room air (0%) and known amount (10%) then re-zero. Use gain to adjust known
amount
nitrogen analyzer Correct Ans-*geissler tube ionizer*
- measures percentage
- calibrate to zero with 100% O2 (0% N2) and a known concentration
, NBRC Review – PFTs Questions and Answers 100%
Solved
aneroid manometer Correct Ans-used in blood pressure cuffs and ventilators to display
pressures
MIP indicating inspiratory muscle weakness? Correct Ans-< 20 cm H2O
MEP indicating poor ability to clear airway secretions? Correct Ans-< 40 cm H2O
lung volumes and capacities Correct Ans-
best indicator of restrictive disease Correct Ans-decreased vital capacity
best indicator of obstructive disease Correct Ans-decreased FEV1/FVC
good but not best indicator of obstructive disease Correct Ans-decreased FEV1
typical value of FEF200-1200 Correct Ans-6 L/sec, decreased values associated with large
airway obstruction
typical value of FEF25-75 Correct Ans-4.7 L/sec, decreased values in early stages of
obstructive disease; usually associated with small airway obstruction
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