Limitations
The main limitation of our study is its retrospective nature. Nevertheless, given the unexpected nature of this pandemia, prospective study would not be realistic. Other limitations includes the fact that not all hospitalized COVID-19 patients underwent laboratory measurements of troponin and/or CRP, thus, having a built-in bias for patients with cardiac symptoms or higher disease severity levels. Moreover, since only part of our patients underwent a 24-hour Holter and continuous ECG monitoring, some transient arrhythmias might have been missed on examination and 12-lead ECG’s. Lastly, we do not have post-discharge follow-up data; thus, our study has probable some underestimation of true COVID-related arrhythmia prevalence, as some arrhythmia could probably develop post discharge.