A day like no other: the Las Vegas mass shooting lessons from America’s largest mass casualty event

The October 1, 2017, mass shooting at the Route 91 Harvest Festival in Las Vegas, Nevada, represented the largest mass casualty event in modern US history, fundamentally challenging traditional assumptions about hospital disaster response. This review analyzes critical aspects of the hospital response, with particular emphasis on throughput optimization, resource management, and adaptation of conventional trauma protocols. Through detailed examination of hospital responses across multiple facilities, this paper identifies three key paradigm shifts: (1) the primacy of patient throughput over traditional surge capacity metrics, (2) the emergence of combat-style triage protocols in civilian settings, and (3) the development of novel resource management strategies. Key findings demonstrate that traditional surge planning assumptions proved inadequate when faced with hundreds of critically injured patients arriving simultaneously without prehospital triage. The incident forced rapid adaptation of military-style triage protocols and highlighted the critical importance of inter-facility resource sharing networks. These lessons continue to influence emergency preparedness and provide a framework for hospitals worldwide to enhance their mass casualty response capabilities.