Changes in the Epidemiology of Ventilator-Associated Events over the Course of the Covid-19 Pandemic.

Management of critically ill Covid-19 patients has evolved considerably during the pandemic. We investigated rates and causes of Ventilator-Associated Events (VAE) in Covid-19 patients in the late vs early waves in 4 Massachusetts hospitals. VAE rates per episode decreased, rates per ventilator-day were stable, and most cases were caused by ARDS.