What are some potential problems with manually refilled heated ...

[khang]

What are some potential problems with manually refilled heated humidifier reservoirs? 1. Cross contamination and infection 2. Variable compliance or delivered volume 3. Delivery of dry and/or hot gases
 
  a. 1 and 2 only
  b. 2 and 3 only
  c. 1 and 3 only
  d. 1, 2, and 3

Question 2

Which of the following automatic feed systems are used to regulate water levels when using a humidifier with a continuous feed system?
 
  1. Leveling reservoirs
  2. Flotation controls
  3. Optical sensors
  a. 2 and 3 only
  b. 1 and 2 only
  c. 1, 2, and 3
  d. 1 and 3 only

[brittrenee]

Answer to Question 1

ANS: D
Unfortunately, the use of manually refilled reservoirs requires a momentary interruption of hu-midifier operation and mechanical ventilation. Moreover, because the system must be opened for refilling, cross contamination can occur. Water levels in manually filled systems are constantly changing, so that changes in the humidifier fill volume alter the gas compression factor and thus the delivered volume during mechanical ventilation.

Answer to Question 2

ANS: C
The simplest type of automatic feed system is the level-compensated reservoir (Figure 38-7). In these systems, an external reservoir is aligned horizontally with the humidifier, maintaining rela-tively consistent water levels between the reservoir and the humidifier chamber. In flotation-type systems, a float rises and falls with the water level. As the water level falls below a preset value, the float opens the feed valve; as the water rises back to the set fill level, the float closes the feed valve. An optical sensor can also be used to sense water level, driving a solenoid valve to allow refilling of the humidifier reservoir.

[khang]

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[brittrenee]

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