What is the most reliable indicator that the gas delivered by a servo-controlled heated-wire hu-midifier system is fully saturated at the airway?
a. Observing no visible condensate anywhere in the delivery tubing
b. Confirming an airway temperature be-tween 32° and 35° C
c. Observing a few drops of condensate at or near the patient's airway
d. Observing condensate over the full length of the delivery tubing
ANS: C
To ensure that the inspired gas is being properly conditioned, clinicians should always adjust the temperature differential to the point that a few drops of condensation form near the patient "wye." Lacking direct measurement of humidity, observation of this minimal condensate is the most reliable indicator that the gas is fully saturated at the specified temperature.
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