A servo-controlled humidifier with a heated wire circuit is being ...

[genevieve1028]

A servo-controlled humidifier with a heated wire circuit is being used on a mechanically ventilated neonate placed in an incubator. What consideration must the therapist take into account when setting up the humidification system for this patient?
 
  A. The temperature of the humidifier needs to be set higher at 55o C.
  B. The heated wire thermistor needs to be located outside of the incubator.
  C. The temperature of the humidifier needs to be set at a temperature of less than 32oC.
  D. A heated wire circuit is not needed when an infant is in an incubator.

Question 2

What is the moisture output of a heat and moisture exchanger (HME), according to this author?
 
  A. 10 to 14 mg H2O/L
  B. 15 to 19 mg H2O/L
  C. 20 to 24 mg H2O/L
  D. >25 mg H2O/L

[jgranad15]

Answer to Question 1

ANS: B
A. Incorrect response: See explanation B.
B. Correct response: The use of servo-controlled heated wire circuits can become complex when the gas is delivered to neonates in an incubator, or those under a radiant heater. The problem is related to the exposure of the two temperatures: room temperature and the temperature of the incubator. In these applications, the thermistor should be placed directly outside the incubator, rather than at the proximal airway of the patient. Otherwise, the servo-control of the humidifier will shut off or reduce the amount of heat and humidity delivered.
C. Incorrect response: See explanation B.
D. Incorrect response: See explanation B.

Answer to Question 2

ANS: A
A. Correct response: Heat and moisture exchangers (HMEs) are passive humidifiers that function similarly to the nose. Hence, they are sometimes called artificial noses. HMEs are not as efficient as hygroscopic condenser humidifiers (HCHs). HME devices have a moisture output somewhere within the range of 10 to 14 ml of H2O/liter at tidal volumes ranging from 500 ml to 1,000 ml.
B. Incorrect response: See explanation A.
C. Incorrect response: See explanation A.
D. Incorrect response: See explanation A.