Which type of humidifier traps the patient's body heat and expire ...

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Which type of humidifier traps the patient's body heat and expire water vapor to raise the hu-midity of inspired gas?
 
  a. Membrane
  b. Bubble
  c. Heat and moisture exchanger
  d. Passover

Question 2

Which of the following are true regarding a membrane-type humidifier?
 
  1. Water and gas are separated by a hydrophobic membrane.
  2. The membrane is permeable to water vapor but not to liquid water.
  3. As with other passover humidifiers, there is no bubbling action.
  4. A small layer of liquid water remains on both sides of the membrane.
  a. 1 and 3 only
  b. 1, 2, and 3 only
  c. 3 and 4 only
  d. 2, 3, and 4 only

[bigcheese9]

Answer to Question 1

ANS: C
Like the nose, a heat and moisture exchanger captures exhaled heat and moisture and uses it to heat and humidify the next inspiration.

Answer to Question 2

ANS: B
A membrane-type humidifier separates the water from the gas stream by means of a hydrophobic membrane (Figure 38-3). Water vapor molecules can easily pass through this membrane, but liq-uid water (and pathogens) cannot. As with the wick-type humidifier, bubbling does not occur. Moreover, if a membrane-type humidifier were to be inspected while it was in use, no liquid wa-ter would be seen in the humidifier chamber.

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[Alyson.hiatt@yahoo.com]

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