COVID-19, coronavirus disease 2019; NSTEMI, non–ST-elevation myocardial infarction; AF, atrial fibrillation; RVR, rapid ventricular response; ICU, intensive care unit; LHC, left heart catheterization; CAD, coronary artery disease; IV, intravenous; CRP, C-reactive protein; GDMT, guideline-directed medical therapy; O2, oxygen. This evidence concerns the gene CRP and atrial fibrillation.