2.1 Search strategy:
A comprehensive literature search was conducted with PubMed and Embase until September 5, 2023. The MedRxiv and SSNR preprint servers were also filtered. We combined Medical Subject Headings (MeSH) terms and keywords, and subsequent search terms were, (( [Coronavirus] or [Covid-19] or [SARS-CoV-2] AND [New-onset atrial fibrillation] or [Atrial Fibrillation] or [Arrythmias] or [Outcomes])) . There were no language or geographic restrictions. We manually searched the reference lists of the included studies and the relevant literature for additional qualifying studies. After removing duplicate citations, the eligibility of the remaining articles was evaluated by looking at their titles and abstracts. The PRISMA flow diagram is depicted in Figure 1.