The amount of condensation occurring in a heated, humidified gas delivery system depends on which of the following?
1. Length, diameter, and mass of the circuit
2. Temperature differential along the circuit
3. Ambient temperature
4. Rate of gas flow through the circuit
a. 2 and 4 only
b. 1, 2, and 3 only
c. 3 and 4 only
d. 1, 2, 3, and 4
ANS: D
Factors influencing the amount of condensation include (1) the temperature difference across the system (humidifier to airway), (2) the ambient temperature, (3) the gas flow, (4) the set airway temperature, and (5) the length, diameter, and thermal mass of the breathing circuit.
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