A Heat and Moisture Exchanger Has an Efficiency Rating of 80

question 59

Multiple Choice

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 humidity at body temperature.