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
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.
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