When using a servo-controlled heated humidifier to deliver gas to an infant, the thermistor probe should be placed where?

a. Inside the circuit, outside the incubator, or away from the radiant warmer
b. Outside the circuit, inside the incubator, or away from the radiant warmer
c. Inside the circuit, inside the incubator, or away from the radiant warmer
d. Outside the circuit, outside the incubator, or away from the radiant warmer

ANS: A
Place heated humidifier thermistor probes in the inspiratory limb of a ventilator circuit far enough from the patient Y adaptor to ensure that warm exhaled gas does not fool the controller system. Never place a thermistor probe in an isolette or a radiant warmer, where the probe is warmed ex-ternally and the humidifier is fooled into shutting down, reducing the humidity available to the patient.