Which of the following is/are true about the flow-resistor breathing exerciser? 1. Exhaled gas flows unimpeded out a one-way valve. 2. Resistance is created by a variable-size orifice. 3. Imposed load varies with the rate of flow
a. 2 and 3 only
b. 1, 2, and 3
c. 1 and 2 only
d. 2 only
ANS: C
Varying the size of this orifice varies the inspiratory load, as do changes in the patient's inspira-tory flow. During expiration, gas flows unimpeded out the one-way exhalation valve. Other types of devices are also available. One model replaces the variable size orifice with an adjustable spring-loaded valve. This ensures a relatively constant load regardless of how fast or slowly the patient breathes.
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