As the COVID-19 pandemic progressed across the world, governments, international agencies, policymakers, and public health officials began recommending widespread use of non-medical cloth masks to reduce the transmission of SARS-CoV-2.
Researchers from McMaster University reviewed evidence about the benefits and harms of alternative noninvasive and invasive ventilation strategies in acute hypoxic respiratory failure in patients infected with COVID-19. Indirect evidence related to other coronaviruses and evidence related to virus transmission to health care workers was also examined.
Based on the evidence, they conclude that use of noninvasive ventilation, similar to invasive mechanical ventilation, probably reduces mortality but may increase the risk for transmission of COVID-19 to health care workers
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