The key difference between a metered dose inhaler (MDI) holding chamber and a spacer is that the holding chamber incorporates which of the following?
a. Larger enclosed space
b. One-way inspiratory valve
c. Heated chamber
d. Series of baffles
ANS: B
A spacer is a simple valveless extension device that adds distance between the pMDI outlet and the patient's mouth. See Box 39-2.
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