Correlates of improved outcomes in patients with COVID-19 treated in US emergency departments.

Background: The COVID-19 pandemic was managed in part by the rapid development of vaccines, diagnostics, and therapeutics including antiviral agents and advances in emergency airway and ventilatory management. The impact of these therapeutic advances on clinically pertinent metrics of emergency care have not been well-studied.

Methods: We abstracted data from emergency department (ED) visits made to 21 US health systems during the first two years of the pandemic, from February 1, 2020 to January 31, 2022.