Equipment Operation C: Valves and Sampling Devices Flashcards
All breathing valves should have these qualities: Low \_\_\_, Low \_\_\_, Low \_\_\_, and easy to \_\_\_.
Deadspace
Resistance
Compliance (Low compliance so the diaphragm won’t bend)
Easy to clean
The patient can inhale, but can’t exhale. Or they can exhale but can’t inhale. What’s wrong?
Valves are on backwards.
How do you tell how much deadspace is in a valve?
Fill with water. Then drain it out and see how much water it was.
A CO2 absorber/scrubber uses what chemical?
When is it used?
Sodium Hydroxide. (Turns CO2 into water.)
Used in tests that require rebreathing. (Helium dilution)
When should you replace the CO2 scrubber?
Barium hydroxide changes from ___ to ___.
Weekly
When exhausted
When color changes (Note: Barium hydroxide changes from white to purple.)
After absorbing CO2, ___ is used as a ___ to prevent moisture from entering equipment.
Calcium Sulfate, Desiccant
Placement of absorbers:
CO2 absorber
Then Desiccant
Then the analyzer.
What is Permapure tubing?
Allows gas to equilibrate with ambient humidity.
What does a pneumotach do? ex: The Wright resperometer
It measures flow.
Not typically used in the PFT lab.
Pressure Differential Device (Fleish) measures ___ by analyzing ___.
Where is it found?
It measures flow by analyzing pressure.
It’s found in the body box.
How do you keep moisture out of the pressure differential (Fleisch)?
Use a heater.
What device is used to measure peak flow?
What patients usually need one of these?
PEFR (Peak Expiratory Flow)
Asthma patients
The PEFR is available in two flow ranges. What are they?
Low range (300-400 L/min) High range (600-800 L/min)
Start on p. A-22
Start on p. A-22
