Limitations
Our study has several limitations. First, accumulating evidence has shown that a minority of COVID-19 patients were associated with cardiac complications, including acute myocardial injury, acute myocardial infarction, as well as myocarditis 26-27, which might result in cardiac structural and electrical changes, causing arrhythmias and palpitations symptoms. However, these effects were not investigated in this study, as only 4 of the enrolled patients had mild elevation of high-sensitive troponin I. Second, since only a small number of patients received psychological guidance due to the relatively limited trained psychiatrist, the therapeutic effects of psychological counseling on palpitations symptoms were not evaluated in the present study. Third, the sample size of the study was too small. Studies with larger populations and in multiple centers are warranted.