Spacers are just as effective, if not superior to, nebulizers for asthma exacerbations
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In adults, spacers are equivalent to nebulizers for delivery of beta-agonists for nonlife– threatening asthma exacerbations. For children, spacers have fewer adverse effects (tachycardia, tremor) and can expedite ED visits compared with nebulizers.
Evidence Based Practice 17(11): 5