Which of the following devices would be the least effective in ...

[mydiamond]

Which of the following devices would be the least effective in reducing a patient's humidity deficit while intubated?
 
  a. A heat and moisture exchanger c. A wick humidifier set at 35 C
  b. An unheated bubble humidifier d. Heated air-entrainment nebulizer

Question 2

An individual's humidity deficit will be the smallest when breathing:
 
  a. oxygen through a heated-wick humidifier.
  b. room air through a heat and moisture ex-changer.
  c. room air at 30 C and 50 relative humid-ity.
  d. by nasal cannula (6 L/min) with a bubble humidifier.

[ntsoane kedibone]

Answer to Question 1

b. An unheated bubble humidifier d. Heated air-entrainment nebulizer

ANS: B
The unheated bubble humidifier has a water vapor output of 10 to 20 mg H2O/L compared with the heat and moisture exchanger, with approximately 30 mg H2O/L; the wick humidifier, with 44 mg H2O/L; and the heated air-entrainment nebulizer, with 33 to 55 mg H2O/L.

Answer to Question 2

ANS: A
A wick humidifier can deliver 44 mg/L of water vapor as compared with 10 to 31 mg/L from a heat and moisture exchanger, 15 mg/L from room air at 30 C and 50 relative humidity, and 10 to 20 mg/L from a bubble humidifier.