5. Limitations and strengths of the study
This study has several limitations. First, the results are from a single center and could not be generalized. Second, it is impossible to differentiate whether NOAF developed due to COVID-19 related cardiac involvement or due to critical illness itself. Third, we could not analyze long-term consequences of NOAF. However, the study has some strengths. We think that our findings are valuable as NOAF development in critical COVID-19 studied to a lesser extent. Second, the diagnostic accuracy for NOAF was high as the diagnosis was confirmed by an intensivist/cardiologist in all cases.