various aspects of non-invasive ventilation in covid-19 patients: a narrative review

non-invasive ventilation (niv) is primarily used to treat acute respiratory failure. however, it has broad applications to manage a range of other diseases successfully. the main advantage of niv lies in its capability to provide the same physiological effects as invasive ventilation while avoiding the placement of an artificial airway and its associated life-threatening complications. the war on the covid-19 pandemic is far from over. the present narrative review aimed at identifying various aspects of niv usage, in covid-19 and other patients, such as the onset time, mode, setting, positioning, sedation, and types of interface. a search for articles published from may 2020 to april 2021 was conducted using medline, pmc central, scopus, web of science, cochrane library, and embase databases. of the initially identified 5,450 articles, 73 studies and 24 guidelines on the use of niv were included. the search was limited to studies involving human cases and english language articles. despite several reported benefits of niv, the evidence on the use of niv in covid-19 patients does not yet fully support its routine use.