Emergency department (ED) visit volumes have increased since 2007, with crowding in the United States reaching its highest levels in 2022. During this same period, mass casualty incidents (MCIs) have increased dramatically, both in frequency and severity, across the United States. Resuscitation of trauma patients is a time-sensitive process that requires immediate patient assessment by coordinated clinical teams in order to successfully diagnose and manage life-threatening injuries. To make resuscitation spaces immediately available for incoming patients, typical MCI plans call for rapidly relocating ED patients from their rooms into hallways or transferring them to open inpatient areas. With current levels of crowding, however, such alternate care spaces are often already in use and traditional MCI plans are increasingly unrealistic. With ED crowding worsening and the frequency of MCIs rising, there is a worrisome risk that EDs could fail in their efforts to save patients due to insufficient resources and spaces to meet the demands of critically injured patients. Hospitals must use innovative, novel response strategies to ensure sufficient patient care spaces in a short timeframe to save the most lives possible. In this commentary, we describe the use of buffer zones to help EDs mobilize an effective response to MCIs in the current context of severe hospital crowding.
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