A heat and moisture exchanger has an efficiency rating of 80%. What does this mean?
a. Of the exhaled water vapor, 80% returns to the patient on inspiration.
b. The inspired temperature is 80% of the expired temperature.
c. Of the exhaled water vapor, 20% returns to the patient on inspiration.
d. The device provides 80% relative humidi-ty at body temperature.
ANS: A
These devices typically achieve approximately 70% efficiency (40 mg/L exhaled, 27 mg/L re-turned).
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