Types of spirometer
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What are the subdivisons of spirometers?
-volume displacement spirometers -flow sensing spirometers
Name the types of volume displacement spirometers
-water spirometer -dry rolling seal spirometer -wedge bellows spirometer
List the types of flow sensing spirometers
-common ypes of pneumotachometers -pressure-differential flow sensor -ultrasonic -rotary vane
Describe pressure-differential flow sensors
detects flow as pressure drops across a screen (metal, nylon, acetate) flow measurement is then integrated to give volume
Descibre ultrasonic spirometers
detects flow as changes in speed of ultrasonic signal from source to detector
Describe rotary vane spirometers
measures flow as a speed of rotation of vane
List some pros and cons of different devices
-cost -portability -ease of use -display -infection control
What are some advantages of volume displacement spirometers?
-simple to use -robust -reliable, accurate, reproducible -hard copy display -stable measurements
What are some disadvantages of volume displacement spirometers?
-not portable -difficult to clean -prone to leaks from tubing and bellows -require regular servicing -flow signal may be noisy -older devices with limited software
What are some advantages of flow sensing spirometers?
-excellent portability -ultrasonic and rotary vane are easy to clean and so maintain infection control -relatively inexpensive -reliable
What are some disadvantages of flow sensing spirometers?
-rotary vane is fragile -pneumotach readings may drift if temp changes -pneumotach readings sensitive to condensation -calibration is factory set