Interventions reducing mortality in COVID-19 patients: a systematic review of randomized evidence

COVID-19 pandemic changed the way medical research is published, possibly forever. As the need for rapidity led to the rise of preprint servers, the undeniable drop in the overall quality of scientific publications requires an in-depth review of all available evidence. The present manuscript aims to identify and summarize all treatments which have been reported to reduce mortality in randomized trials in hospitalized COVID-19 patients.

Independent investigators searched MEDLINE/PubMed, Scopus, and Embase databases to identify all randomized trials of any intervention influencing mortality in hospitalized COVID-19 patients up to August 18^th, 2022. Articles were selected only when they fulfilled all the following: randomized trial design; dealing with any kind of interventions in adult hospitalized COVID-19 patients; and statistically significant reduction in mortality.

We identified 28 interventions (42 manuscripts) reducing mortality in hospitalized COVID-19 patients. About 60% of the studies (26/42) were multicentric, for a total of 1140 centers involved worldwide. Several of these studies were published in high-ranked, peer-reviewed journals. Interventions with randomized evidence of mortality reduction in hospitalized COVID-19 patients belonged to 5 domains: corticosteroids, immunomodulators, antimicrobials, supportive therapies, and other drugs.

Many interventions have the potential to reduce mortality in COVID-19 hospitalized patients. The correct treatment of future pandemics relies on large, multicentric randomized clinical trials for further evaluation of these promising strategies.