PFT equipment Flashcards
What are the purposes of PFT equipment?
- identification
- quantification
- epidemiological
- post-op risk
- pulmonary disability
- therapeutic effectiveness
What does identification mean?
detect disease
What does quantification mean?
quantify and determine the reversibility of a disease
What does epidemiological mean?
screening that detects disease from environmental or occupational inhalation
What does post op risk mean?
test for pulmonary complications that could occur after surgery
What does pulmonary disability mean?
determines if pt can go on pulmonary disability (usually through medicare)
What does therapeutic effectiveness mean?
select treatment based on disease, give treatment and then measure to see how effective therapy was
What is a spirometer?
a device used to measure volume or flow at the airway opening
What is volume displacement?
collects exhaled gas and measures displacement of the gas/device
What are the three types of volume displacement equipment?
- water seal stead wells
- water seal collins
- dry rolling seal (horizontal)
What does the water seal stead wells measure?
volume and time
What does the water seal collins measure?
volume and time (most accurate device)
What does the dry rolling seal (horizontal) measure?
volume and time
What are some flow measurement devices?
- turbinometers
- sonic devices
- peak flow meters
- pneumotachometers
What are some examples of the pneumotachometers?
- turbine device
- fleish
- thermal
- ultrasonic
- peak flow meters
What is a turbine device?
wright spirometer (gold standard); mechanical (rotating vane)
What is the fleish?
pressure differential. better with laminar flow
What is thermal?
flow cooled. temperature sensitive. changes resistance with temp
What is ultrasonic?
signal disrupted by change in flow. doppler effect
Peak flow meters
- repeatability is more important than accuracy
- reproducibility should be within 0.67 L/sec or 40 LPM
- within instrument variability of 0.15 L/sec or 10 LPM
- between instrument variability of 0.3 L/sec or 20 LPM
- choices are high (850 LPM) or low flow (up to 400 LPM). typical is 10 L/sec or 600 LPM
What are the pulmonary function principles?
- capacity
- accuracy
- error
- precision
- linearity
- output
What does capacity mean?
range or limits of how much it can measure
What does accuracy mean?
how close it is to actual
What does error mean?
determines accuracy. math difference between measured and reference values
What does precision mean?
reproducibility. how precise
What does linearity mean?
how accurate it is over an entire range or measurement
