The key difference between a metered-dose inhaler (MDI) holding chamber and a spacer is that the holding chamber incorporates which of the following?

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The key difference between a metered-dose inhaler (MDI) holding chamber and a spacer is that the holding chamber incorporates a one-way inspiratory valve. This valve ensures that the medication is delivered directly to the lungs and not lost in the environment. A larger enclosed space, heated chamber, and series of baffles are all features that may be included in either a holding chamber or spacer, but they are not the key difference between the two.

The Key Difference Between a Metered-Dose Inhaler (MDI) Holding Chamber