Which of the following humidifiers delivers water vapor and microaerosols to the patient, which can transmit bacteria to the patient if the reservoir becomes contaminated?
A. wick humidifier
B. passover humidifier
C. bubble humidifier
D. cascade humidifier
?ANS: D
A. Incorrect response: See explanation D.
B. Incorrect response: See explanation D.
C. Incorrect response: See explanation D.
D. Correct response: The cascade humidifier is an efficient bubble humidifier. It directs gas from the ventilator and bubbles it upward through a grid. The grid creates a froth of small bubbles that absorb water. In addition to delivering water vapor, the cascade humidifier delivers microaerosols, posing the threat of bacterial infection if the reservoir becomes contaminated.
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