ACE2 and cardiac arrhythmia: In this review, we highlight a variety of findings reported to date including arrhythmias in patients with COVID-19, reported cases of myocarditis, ECG changes in an animal model infected with coronavirus, arrhythmias in critically ill patients, cardiotropic viruses and arrhythmia, implications of ACE2 in cardiovascular disease, hypercoagulability, and hydroxychloroquine for the electrophysiologist (Figure 1).