To the Editor: Walters and Dawson1 highlight growing interest in new models of care aimed at ameliorating hospital-bed pressures and access block. They advocate acute medical assessment and admission units (AMAAUs) as a potential solution, and claim, principally based on the United Kingdom’s experience, that these units can significantly improve clinical care and patient outcomes. A recent systematic review confirms that these units (which have attracted several different synonyms) have promise, although controlled trials have yet to be performed, and publication bias remains a potential confounder.2
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